Customer Ratings & Reviews

I've seen the testing data and reviewed testing video comparing this oil to Royal Purple, and others. It is by far the superior performer. Nothing but the best for my baby! Never disappoints.

First time to use in my vehicles, will let you know more in the future how I like it. Also I do use it in my small equipment and no problem with it so far. Thanks.

I noticed the smoothness of the engine almost immediately. I used Castrol for many years and I noticed my engine was sluggish but since switching to the signature series from amsoil, I'll never use anything else again!!

Amsoil Signature Series Oil, is indeed at the top of all oils, it’s made my engine run much smoother and no longer burns any oil. I’ll continue to use AMSOIL in all my cars and recommend it any day!

I use this once a year and it works great.

This oil gives me the confidence to run the 10,000 mile OCI recommended by my Honda maintenance minder.

“Engines aren’t cheap to repair. I run Amsoil because it handles heat, abuse, and long intervals without turning to sludge. Less wear, more horsepower, peace of mind.”

Introduced to Amsoil in 1978. Been using their products since and feel they have the best research, product line depth and database for compatibility.

good product

I run this full synthetic in my 06 Silverado 2500 HD with over 200,000 Miles . When my oil change indicator comes on I reset it so I’m getting twice the use out of my oil. I also have quiet cold startups.

I have been using amsoil filters and oil going on Five years with zero issues! Great products fantastic customer service some of quickest shipping that I have ever used ,Great support From my Rep Brian at Bmore lubricated Thanks Keep up the good job

I’ve used this particular oil in many different vehicles over the years all fords & all have held up great. Including my 2011 F150 5.0 that had 712k on when I sold it. Even my current 2020 Ford Raptor which has 50k trouble free miles. I’d give this oil 10 stars if I could & to me that’s speaks about all amsoil products.

Great effective oil

Been using ams oil for 2 decades never have I had oil sludge or engine issues it’s proven it self time after time

this stuff is great! use it in all my vehicles- wish AMSOIL would include a sticker so I can keep track of my oil changes, but don'y need to buy 100. With AMSOIL, I don't need to change my oil that often!

This is the best motor oil, and worth every penny!

The best there is made right here in Wis.!

I have been using Amsoil products exclusively in all of my motors for over 20 years. I have never had a major part failure due to problems with the oil. Most of my vehicles have had well over 150K miles on them when I sold them and they were operating very well.

I use in everything I own

5w30 signature series makes my jku nice and quiet