This is the only oil I use in my ‘06 Jeep TJ. It’s the best oil out there in my opinion.

Signature Series is the crème de la crème of amsoils line. I run it in the wife’s Ecoboost explorer and it’s phenomenal. We have had several oil samples before and after switching to this oil and the samples since running this oil are always in the green. It’s cleaned in the inside right out with their detergents and I feel great knowing at least on the oil end of things were doing it right.

I’ve started using AMSoil for 30+ years ago and I haven’t regretted that decision for a single second. Also as a preferred customer (and the associated cost) it’s even cheaper than buying any other full synthetic brand in a store. On top of that, when you buy in bulk it ships to your front door for free. The protection and longevity of this oil is a win win win!

It is hard to believe in a 1 year/25k mile change interval, but it is real! I kept checking my oil the first year to see if it needed changing and it was fine even at the one year mark with 18k miles. I changed it then, but it still looked fine! 10 years later my vehicle is over 200k miles without any engine issues at all. I also flushed the transmission with OE at 110k miles and no problems with the trans either! I am sure my power train will outlast the body. Maybe Amsoil makes rust inhibitors? I'm going to check right now!

I've used lots of different oil over the years but this is the best I have found.

It's oil what can you say! I have used this from the first oil changes in my Fusion Sport and F150 2017 & 2016 I have had no engine problems at all (Shocking) won't say it's only because of oil but I know this stuff is good and will continue to use it. I go 10k max and change the oil and from the looks of it I could go further but wont...

There’s Mobil 1, which is very good and then AMSOIL! I always have a sense of relief after an oil hand on the Vette and Land Rover.

Great oil at a high price. If you love your vehicle, amsoil is where it's at.

First in synthetic since 1971, I wouldn’t use anything else. I have Amsoil in every place I can put it in my vehicles, lawn mowers, 2 stroke weed whippers, you name it.

Like the title said, best oil I've tried in my car thus far. Used to use Castrol Edge high mileage oil, which did do a good job, or what I thought was a good job anyway. The engine seems to be getting smoother the more I drive it, probably getting cleaned out (it has around 300,000 miles, I'd be surprised if it was perfectly clean, even after using this oil). I chose this one cause after reading up on the different oils amsoil has, it seems that this does what the high mileage oil does and then some, hopefully will help those who may be confused like I was at first.

Got better horse power and got an extra 2 mpg

At times i've pushed my oil to the limit and it still held up and at times i've pushed my oil past the limit and it still did it's job. you can't get a better motor oil for any situation.Great oil pressure all the time even when the oil has high milage on it.I use 5W/30 signature for 8 years now in my Toyota sequoia witch i bought used and it does not use a drop of oil. my Suv is an 05 sequoia with 140,000 and it runs brand new. thank you Amsoil for a superior product.You will always have a life time customer.

Great oil running good and smooth through my 06 Cadillac sts!

Been using Amsoil products for 30 years never a failure.

After a tons of 5 stars reviews of this oil, I decided to start using it. So far the car feels more quiet, smooth and responsive. I feel more confident in my brand new SUV with Amsoil on it. So far very Happy. I recommend it.

Have used AMSOIL for years on many personal performance vehicles. Purchased a new RAM TRX and like my other vehicles use only AMSOIL. I have had my oil analyzed on all my vehicles with impressive results. AMSOIL is a proven product and you won't find a better performance oil for any engine application.

Only have about 200 miles on the AMSOIL but I did a lot of reading up on this product it is a little pricey but I’m running it in my 2024 mustang gt so I wanted to go with the best possible oil I could run

can’t believe it. I noticed the car is now getting 3 to 5 more miles per gallon. I try to think it couldn’t be the oil but yes, it absolutely is the oil. This is the first long trip on this oil after changed. I am happy.

Travel 55k miles per year and have used Amsoil motor oil in 10 new vehicles in last 20 years with mileages over 260k miles. Very dependable with not engine problems.

Was sold on it when we changed over to synthetic oil in vehicle and it almost stopped using oil