Signature Series is the number one oil, proved through testing and comparison, Amsoil is the best protection for your engine.

Can't get better than Signature Series. Definitely worth the small amount of extra expense for the extra protection.

First time trying amsoil in my truck. Made the switch from Rotella T6 to Amsoil so far I’m real happy with it definitely is quiet the engine down!

I would recommend Amsoil product to all my friends and relatives. Can never go wrong at all. Huge difference I have noticed since I started using amsoil

Just rebuilt my first engine..broke her in with 10w30 dino...went 3k with mobile and figure why not? I just a little 1.8 celica gt engine at 183k and realized I just rebuilt an engine and after that I felt she deserved the best. I'm confident after I put in the whole jug that I could run it till the stated 15 to 25k but oem says 6k. I'm confident with amsoil that I'll break 300k no sweat.

The day I bought my 2005 F250 home I dumped the stock oil and refilled with Amsoil 0W20 and a EAO11 amsoil filter. That was 16 years ago and it still going strong. I would never use any thing else.

I have been using this since the day I bought my Ford Explorer and have never had a problem. Bought the truck home and dumped the stock oil and refilled with Amsoil 5W20 and a Amsoil AEO17 filter that was 3 years ago and will never use anything else.

Have used amsoil in all my vehicles for over 30 years , and have never had problems, if you are trying to decide if you should use amsoil its a no brainer , your car will thank you for years!!

I used Amsoil ever since I heard of it. Last time I changed my oil was in January 2020 and I just changed it in March 2021. Stuff works great. Shipping was super fast, only a couple days!

This oil has better protection and can be used for 25 thousand miles between changes with the right filter

I've used this oil in more then one I've owned and will keep using it ...

Quality oil as usual.

Excellent products. Still currently begging for some decals. Seems odd since I am surrounded by vehicles with Amsoil products and wearing an Amsoil tshirt and looking at a huge Amsoil vinyl banner in my shop (I bought both). I have never asked for anything. Maybe I am just the little guy. It irks me.

Twice, out of curiosity, I sent samples to a lab for analysis after 16K miles of use. Both times all viscosity and additive levels showed I could run the oil for several thousand more miles. That is with towing, highway and local use mix. Contamination levels also lower than tolerances thanks to amsoil filter. I change oil no more than once a year. Sometimes almost 2 years in my 2002 Toyota Sequoia. Great products.

Use for my Toyota Tundra Truck V8 change one a year due to low mileage. Works great no oil usage and provides great protection.

My first time using this particular product and I am blown away by its performance. Within just the first few minutes of using this product. I immediately noticed my engine idling much smoother and it sounded better harmonically as well. Like it was more in tune and moving freer. I've never had automotive product work so well, ever. Great job AMSOil team. In my opinion well worth the money. I was using Subaru premium synthetic motor oil for the past 2 years with full service included. My vehicle only has about 20K on it and is very well kept. And I still noticed a tremendous difference. Bravo Zulu

I put this oil in my 2017 Ram. I had 90,000 miles on it. Now it has 93,000 on it. Compared to Penzoil Platinum oil when I put a few thousand miles on it, Amsoil still looks new. I plan on putting 5,000 more miles on it. I'll see how it looks then.

Keeps my engine running clean and smooth!

Great oil and competitively priced to other synthetics if you are a preferred customer.

Great