Product Reviewed: Signature Series Motor Oils
Current Rating: 4.91 out of 5 stars
Votes & Reviews: 163 vote(s) and 1024 user reviews.
Reviewed by Healey: 
Good cold weather starts
Reviewed by Whzone:
made a grate difference engine is quiet with a 10% better on gas can't wait for my next oil change
Reviewed by Thomas:
I've used this product on my 2014 Jeep Wrangler, I love this oil been using it awhile with no issues what ever
Reviewed by Travis:
07 FJ cruiser with 150k miles, as soon as I dropped this stuff in, lifter rattle was gone
Reviewed by Rosopower:
Hard To start very cold day
Reviewed by Cliff:
I use Amsoil oil, and fluids in all of my seven vehicles, from bumper to bumper, witch has cut way down on repair, down time and oil consumption..
Reviewed by navret02:
This oil really makes me feel safe knowing the protection it gives!
Reviewed by L. Barr:
Best form of lubrication for any automobile in my opinion.
Reviewed by L. Barr:
Only product for my cars.
Reviewed by Chris:
I use this in my Ram Rebel 1500 and it keeps the truck running smooth.
Reviewed by Dan:
I live a very cold climate. Temps sometimes get down to -30F with wind chils to -50 or more. My vehicles sit out side all year.
I've never had a problem starting them, no mater the temp.
Reviewed by Pink MG:
I use AMSOIL signature series in my new Ford F-150 because the protection is great, the change intervals can be extended if necessary without lubrication properties breaking down. It conveniently shows up at my door via free shipping as a preferred customer.
Reviewed by drm:
This is my first round of 0W-20 Signature Series for a 2015 Suburban as well as a 2016 Toyota. Paired with AMSOIL EA Filters, I trust the recommendations of the vendor. I've never had an issue whatsoever. Oil consumption using Signature Series 5W-30 on previous vehicles with over of 180K and 207K miles was ZERO. I loved the cold weather start and 1x/year oil changes (avg 17K miles/year).
Reviewed by PDFAMILYMAN:
5W20 is for my 2010 Ford Ranger. I run it hard, and the oil does it's job flawlessly. I use AMSOIL on all 5 of my vehicles. I won't buy anything else but AMSOIL.
Reviewed by Johnny's machines:
I use Signature Series 5W-30 in my '98 Subaru (138,000 miles), and it couldn't be happier.
Reviewed by Robert:
Amsoil got my business in 1983 when we were running two stroke outboard engines at very high RPM's in a racing format. After one season putting the engine through these conditions we would rebuild the engine. After the year was up the cylinders still had the hone polishing marks visible to the eye on the cylinders. Every gas or diesel engine I have owned since that day runs on Amsoil and only Amsoil. Why would I try anything else. The extended run time only makes it a better product as far as price. You can get this quality at or near the same price as just oil.
Reviewed by Jeff:
I have been using this amsoil in my Jeep JK 2017 since new, and it seems to be preforming well I also have it in front and rear differential.
Reviewed by C' DAWG:
Have been using AMSOIL products 4 more than 20yrs. No bone 2 pick. No vehicle I've owned has used oil, excellent performance. Engines, transmissions, manual & automatics, & live drive axles! No problems ever! I will only use AMSIOL! THANX ABUNCH AMSIOL!
Reviewed by Dave:
I have been using high mileage synthetic oil for the last 5 years. When i got my emission chech the technician was confused, he said , ' the engine is running so clean, its like purifying the air' !
Reviewed by KNC:
I have used this product for 16 years with excellent results. (All around good oil analysis, much lower cost, time saved.) I recommend this oil whenever possible.
Reviewed by Willy:
Great as usual.
Reviewed by
Yogi:
I have used this in a few autos as well as a 4 cycle toro, superb engine protection, second to none cold weather starting as well as lower operating temps in the hottest days of summer. Very highly recommended! !
Reviewed by Mr. B:
This Amsoil Signature Series engine oil is the best I've used.
I call it my liquid Gold. I would highly recommend it.
Reviewed by Old guy:
My Ranger has 210,300 miles. All original engine except fuel pump. Runs great. Amsoil in engine and tranny since purchase.
Reviewed by Dylan T:
I like to keep my car in tip top shape, so I use amsoil.
Reviewed by bogator 2:
A friend of mine has been using this oil for many years and finally talked me into trying it, I have always used synthetic oil but decided to give this one a try, love it..
Reviewed by Vette:
Used for years #1
Reviewed by John:
Amsoil Signature oil is the very best oil on the market and I use it in all of my vehicles.
Reviewed by Al:
This is another product I've been using since it's introduction paired with the EA filters. They make a great combination for protection
Reviewed by Joe:
I have been running this oil in my Silverado and my Chevy SS and this is by far the best oil you can use. Now I still change my oil based upon the intervals the car tells me but the protection you get can't be beat. My oil analysis have come back excellent!
Reviewed by Gregthecarman:
Use this in my 2016 Chevy SS, and in my wife's Ecoboost Flex. It minimizes oil use and improves mileage. Was using Mobil 1, switched to Amsoil (after free dealer oil changes ran out) and oil stays clean longer and mileage improved about .5 mpg in both cars. This is year over year, not tank to tank... Both cars rarely see the highway nowadays (both wife and I switched to jobs close to home so side streets to and from work it is)...mpg's going from 14 to 14.5 doesn't sound like much, but it is something!
Reviewed by Fisherman:
I bought a n oil change for a friendgreat product
Reviewed by 2018 Accord:
Best oil I have used so far. 9k miles on it and oil is still good.
Reviewed by ANGLICO:
I used the Signature Series oil on my 1992 Land Curiser with a 3FE inline 6 cylinder motor with 230,000 miles; I replaced the oil filter as well.
The new Amsoil oil change noticeably fixed several issues I was having with this old motor. The oil pressure stabilized, compression, temperature, noise, and gas mileage all improved as well. No more leaking head gasket seals, burning oil, and more throttle response.
Reviewed by MR.HAPPY:
Feel better engine performance,also the mix of higher octane of gas helps also,love that it limits me to one oil change per year depending on more driving or less.
Reviewed by Berky:
Amsoil is the only oil company that I've ever been able to provide 3rd party testing documentation against other synthetic oils back when no other synthetic manufacturer would provide that sort of information. I switched from Royal Purple to Amsoil when my father recommended them. I asked them to provide documentation that they were the superior product and I would switch. They did and I've been a loyal customer for over a decade now.
I drive all of my vehicles I've owned hard. I feel they are made to be driven, so I drive them hard and push them simply for the joy of driving. If I am going to purchase a sports car, I plan on driving it like one. I use Amsoil to make certain the internal parts of that engine have the best protection I can give them all year around. I have never had an internal part failure on any
vehicle I have ever had due to lubrication failure. I trust no other oil to be in any vehicle I own, and I push my friends and family to do the same.
Reviewed by Miles:
Bought to use in a 2018 Honda Accord 2.0 turbo as the stock oil was burning up and leaving black soot all over the back of my car. The amsoil doesn't do that and now I feel confident about my car not blowing up from lack of lubrication and costing me a ton on money to fix. Just wish they sold it in a 5 quart jug cause having to buy a gallon and then a separate jug is a pain and the individual quarts aren't cheap.
Reviewed by Mike:
This Oil is Great. Always Recommend this to others.
Reviewed by Bkrguy:
Finally tried Amsoil. I put it in my 2013 Cadillac and noticed an instant difference. Smoother idle. Smoother acceleration. Increase in fuel mileage. I will be using Amsoil from now on in all vehicles.
Reviewed by Mike:
I changed to Amsoil in 2014.I had a new Chevy truck and by changing to Amsoil 0-20 increased MPG by 1.5 per gallon. It worked great for 75,000 miles. Traded trucks for a 2017 Chevy and changed with Amsoil the first oil change. Just great oil. I also use Amsoil 20-50 in my Harley Davidson which runs cooler than any other oil that I have tried. I run the 20-50 Amsoil dirt bike oil in my 2015 YZ250FX works great. I recommend Amsoil to all my friends. Amsoil has never let me down.
Reviewed by Mike:
I use Amsoil in all my vehicles, 2015 Ford Explorer, 2005 F250 super duty, 2016 GL1800 Goldwing, & 2008 Ford Taurus, It's a super high grrade of oil and I had a 1996 Chevrolet truck 5.7L that i had over 250,000 miles and had pulled the valve covers and it looked as clean as if I had just rebuilt the engine !
Reviewed by Jackal:
Been using and oil puducts for years it's by far the best lubricant in the industry!
Reviewed by Dan:
You cannot find a better oil in America than Amsoil. Read the test data and all the reviews. I was always taught to do research on products to find the best. Thats what I did. AMSOIL is the best!
Reviewed by GarryW:
I have been using AMSOIL Oil for a number of years. I have 340,600 miles on a 2003 SVT Focus and have been very pleased with how AMSOIL OIL has protected the engine.
Reviewed by Robert:
I have been using amsoil 5w-30 on my 2004 range rover hse and 2008 range rover hse for almost 15 yrs now and these oil brings back old cars back to life instantly from fuel efficiency to engine fluidity. Engine feels like new. I change oil from 6-8 months or 7500 miles.
Reviewed by Dave in CO:
Love the performance of my motorcycles w this oil.
Reviewed by John:
Used signature 10-30 synthetic in my 2002 sequoia and drove almost 15,000 miles before changing the oil and filter. I sent a sample of the waste oil to a lab for analysis. The oil was good, still usable, with no traces of problems.
Reviewed by Gerry:
I've been using Amsoil for almost 20 years, my 1999 GMC Yukon Denali, 219,000 miles, and 2008 Mitsubishi Outlander SE, 221,000 miles using 0w30 Signature Series and both still going strong, and now a 2016 GMC Canyon Diesel truck using the 5w30 European Formula, Highly Reliable Product in my book.
Reviewed by Rustdoc:
I use Amsoil in all of my vehicles. I have found it saves fuel and makes my engines run much smoother and cooler. I have proved the use to many friends with my Harley's showing them how ell they perform also.
Reviewed by Tony D:
Motor run smoother get better gas mileage and change the oil less Oil still looks great when it comes out
Reviewed by Dave:
Have been using Amsoil everywhere possible, don't have to ask twice.
Reviewed by Rick:
The third party tests only depict the facts. But I have many years and many vehicles that only used Amsoil. I appreciate that Amsoil offers OEM and other options. That's awesome. But I've always gone with the Signature Series oils. I keep things as simple as I can. I don't want anything but the best, and I don't want to have to second guess engine protection. A full year (repeated years, one is a 13 yo Focus I bought new), that has never been more than a half a quart below full at its annual oil change. ??? Why scrimp on protection when I'm saving money and producing much less recycle oil, AND the car runs awesome after all these years?
Reviewed by Mobilemotormedic:
I switched from conventional oils and filters back in 2012 and its been the best decision I've made concerning lubricants.
Reviewed by Mr. Bob:
I have used this since the first oil change in my car that I bought new in 2016. Newer vehicles call for a 0W-20 oil. With that thinner weight oil I am concerned about wear protection. Looking at independent test lab results of Amsoil 0W-20 oil I see that it does better than other oils and passes the tests with ease. My car also has variable valve timing which can be vulnerable to sludge buildup. A clean synthetic oil is a must and the Amsoil additive package fights sludge better than others. We get easier cold weather starts and slightly better mpg too. Spendy but good.
Reviewed by Stan:
I believe that Amsoil is the best motor oil that you can buy.
Reviewed by BH:
Keeps my Subaru DIT engine running smooth. I wouldn't put anything else into a turbo charged engine.
Reviewed by Coyote:
Great product
Reviewed by shotz:
Oil seems to work very well . This is the second oil change with it - so we'll see how it goes from here
Reviewed by Eric:
I have used Amsoil forever. I dont trust any other oil in my vehicles.
Reviewed by
Charlie:
I really have enjoyed the switch to synthetic, I was super pumped to open up my kit in the mail.
Reviewed by Rond:
Bar none, Amziol products are the absolute best you can buy! For everything you own, farm, lawn and garden , cars, trucks
Reviewed by Subaru man:
Just turned 120,000 miles and the engine is very quiet and runs like new.
Reviewed by Wrangss:
Excellent engine protection with the long term performance provided by Amsoil. Consistently better mileage than any other lubrication product. Would recommend to anyone wanting the absolute best in engine protection and lubrication.
Reviewed by Jeff:
Use this in my 2011 Camry with 250k miles since new changing it every 25k miles
Reviewed by DM:
My go to oil for 05 and 10 Impala. Used Amsoil since buying the cars with approx 60,000 km on each. 40,000 km oil changes within 12 months with a filter change at around the 20K km mark. I had 345K on the 10 Impala when the transmission gave out - motor was strong. The 05 is still running well with over 395K kms. Has to have something to do with good quality oil.
Reviewed by J. Rasmussen:
I only use Amsoil. Wouldn't waste my time, money or vehicles on anything else.
Reviewed by Josh:
I have used this for a few years now and has provided the best protection out of all the oils out there for me.
Reviewed by Green Dragon:
My '14 Outback V6 requires 5W-30 I have used Amsoil every 5,000 mile or 6 months to meet warranty requirements since my first oil change at 1,000 miles in 2014. At 50,000 miles the V6 still hums like a sewing machine
Reviewed by Green Dragon:
When I purchased my 2014 Tundra, I asked the dealership service writer I have known for 25 years for a recommendation regarding motor oil. He suggested Amsoil. I have been using Amsoil in my Tundra since October '13; I also use Amsoil in my Highlander, my wife's Camry, my Honda lawn mower, and in my John Deere Diesel garden tractor. So far, everything still runs like new.
Reviewed by Brad:
I run Amsoil in my truck and snowmobile.
Reviewed by Eric:
My car runs way better and bring out lots of power
Reviewed by Jim:
Signature Series oil is unbelievable. I have had multiple vehicles with two hundred to three hundred twenty-five thousand miles on them and Amsoil keep clean like new. I also have 22 and 38 year old tractors that use no oil.
Reviewed by JP:
Never in doubt...
Reviewed by Leaper:
Hands down the best oil I've ever used in all my trucks and suvs
I saw improvements in fuel mileage
Lower rpm at idle
Cooler temperatures
I will never use anything
else but Amsoil
Reviewed by Yan5366:
My bmw 328 run super great ... incredible in cold temperature....thanks
Reviewed by Grumpy Too:
I only want the premium best for my new Camaro SS-That is Amsoil!
Reviewed by G-Train:
I use Amsoil Signature Series in all of my cars, from my truck, daily drivers and four various Porsche models. Nothing better and I will never switch!
Reviewed by ZacG:
It's expensive but for protection it's worth it. It seems to be the best wear protection of any oils I've tried in my various vehicles
Reviewed by Josh:
Use it in all my cars, only oil that my cars don't drink like water.
Reviewed by Camaro6:
I have a 2016 Camaro ss that started to burn a little oil with the valvoline full synthetic I was using. I started using Amsoil and two oil changes later the car hasn't burned a drop of oil and the oil seems to hold up a lot better. I will only be using Amsoil in my cars from now on.
Reviewed by Rat:
Been using this oil for years.
Reviewed by Dale:
Switched over to Amsoil in my F-150 with the 5.4L Triton. Switch over with just over 100k on the truck. I did use the engine flush per recommendation. I did notice that it is quieter on start up at sub-zero(-20f) temperatures. I have oil pressure at turn key! A must have in the Northern area.
Reviewed by Higg:
I use this 5w30 in a 2006 explorer with over 200,000 miles and have no issues.
Reviewed by Shiz:
Best oil in the market use it on all our cars!
Reviewed by Harry:
Best oil on the market. Buying anything else is foolinness.
Reviewed by B:
The type of oils and fluids that go into my vehicles etc hands own #1 in the business you want the best from your vehicle then you have to use the best.
Reviewed by MTpDog:
Excellent oil, I use Amsoil in all my mechanical equipment and they last a long time!
Reviewed by Brian:
I use Amsoil in my pick up, I like the piece of mind of knowing I have the best possible protection for my engine.
Reviewed by Tim:
I am a relatively new user, but the research I have done has all been positive and enthusiastic, both from friends and online.
Reviewed by Barry:
Decided to switch from Mobil1 to Amsoil for my Toyota cars. Went with the 25,000 mile oil so I don't have to change oil so often. Once a year oil change is perfect for me. Very pleased and it's such a better oil.
Reviewed by 1973:
Used and followed Amsoil for most of the last 45 years. It's always got the job done and the 5W-30 has worked great whether it's winter or summer. Change it once a year and forget about it. Even in my older high mileage cars, they make it from oil change to oil change without having to add. I love it. Can't understand why anyone would use anything else.
Reviewed by Eric:
I use the Amsoil 5w 30 and the Ea Amsoil Oil Filters in both my 2018 Chevrolet Silverado and Tahoe. The quality and durability of the Amsoil is second to none.
Reviewed by Don:
noticed when i put it in the engine ran quieter
Reviewed by Bstill48:
Great product. I drive 120 miles a day to go to work. I increased my gas mileage and can tell the difference in the engine in how quite it runs.
Reviewed by Chuckle Berry:
I use Amsoil for all my vehicles, have done so for over 15 years, won't trust their protection to any other oil.
Reviewed by D:
Great products keeps engines clean and lubricated
Reviewed by Jerry420:
I will only use amsoil products in my vehicles and for the price u can't beat it
Reviewed by Mel:
I use this oil in my ZL1 Camaro and it makes the car run cooler and the means that less friction, i have no dislikes
Reviewed by Dave:
Nothing better out there for my 6.4 hemi.
And my sxs vehicle's
Canada
United States
Best money can buy.
Extended drain intervals, combined with my bypass filter, I'd drive this thing to the moon if I could figure out how to get it off the ground!!