Product Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)
Current Rating: 4.91 out of 5 stars
Votes & Reviews: 163 vote(s) and 1024 user reviews.
Reviewed by Daniel: 
I used this oil in my cars, good performance and gas improved. I recommend 100/ I put in my Acura TSX real pure Synthetic
Reviewed by Kenny:
I use this in my 454 big block one tone and she works hard pulling a 14000 pound trailer fantastic love it
Reviewed by Stephan:
Oil works great, quieter smoother running engine .
Reviewed by Walter:
This oil I use in my trailblazer and impala
Reviewed by Andrew:
I run this oil in a 1993 Dodge W250. This oil works great in this old truck. I am very happy with Amsoil, it is all I run in my equipment.
Reviewed by Howard:
A little thicker for an older car with many miles.
Reviewed by Larry:
I believe synthetic oils are great for any moving metal parts. No wear, No friction, saves money in years to come and makes my engines very dependable. My Pontiac now has over 260,000 miles and uses no oil, no smoke. Thanks to Amsoil!
Reviewed by Jeremiah:
If you were looking for the best you've found it! As simple as that!
Reviewed by Jeremiah:
The most superior motor oil in world! It actually last 25,000 miles in my 2009 Toyota Venza and 2007 Chevy Malibu! When I drain it at 25,000 miles it doesn't look like its even lost its viscosity or characteristics! Best oil on the planet!
Reviewed by Cody:
I have always loved amsoil products. I have a 2001 ss monte carlo and unknown to me that my motor had a internal coolant leak and I have used amsoil in it forever. I had put on over 200k on this motor w/leak before I developed a rod knock. I give amsoil all credit in that this engine went that long before it gave out. Love amsoil
Reviewed by Shane:
Its great stuff use it in my 1999 Tahoe
Reviewed by David:
Used in my pickup along with Amsoil gear oil in the rear end and noticed an increase in fuel mileage.
Reviewed by Craig:
I don't put anything else in my vehicles.
Reviewed by Carolina Traveller:
Learning that most "Conventional" oil lose is caused by consumption (boil off, blow by, clearances ect).
I decided to give it a try in my 340K mile Pontiac (45K on a new rebuilt 3.8l HO V6).
Not only did the oil lose stop it actually helps cool the engine down better now.
Bonny runs smoother. She has always been fast so I do not notice a performance increase.
Gas mileage improved. I was getting 17-18 mpg highway. Now I get 22-23 mpg.
I get 16 mpg city period. No improvement there. My suspicion in my lead foot has a lot to do with that.
At first consumption seemed to be the same.
Talking with the local guy he reminded me of the oil cooling lines and oil cooler underneath.
That's a full extra quart of conventional right there.
Once that boiled off (2 weeks) the oil level stayed constant.
I am on my second oil change now. New Amsoil recommended oil filter and new Signature Series 10W-30 Synthetic Motor Oil.
Funny thing was that after 15K
miles it was still pretty clear.
I have 5K on her since this oil change. Still clean on the stick.
I became a preferred customer for the savings it offers me and my 9 vehicles.
Cutting the oil changes down to 1/4 of what they were makes up for perceived "extra" expenses.
the performance and stability of it makes it well worth it.
Signature Series 10W-30 Synthetic Motor Oil will be going into the Motor Home next.
Reviewed by none:
When I went to all synthetic products on the motor home the transmission stopped slipping and my mileage also improved.
Reviewed by Roge:
I've tried them all, and I was never happy entirely with the other oils. Some burned, some lost viscosity way too fast and some looked straight black just after a few thousand miles. That being said so far I'm loving Amsoil, doesn't burn, always looks clean at changes and holds viscosity. So far, signature series has been my favorite oil for my 2004 Evo 8. +1 to Amsoil I feel like I can trust it when I tracking the car or driving it around the streets.
Reviewed by Terry:
I actually recommended to my friend so its for him and he's been using it for years. I have been using AMSOIL products for over 38 years. I have used almost every product AMSOIL makes.
Reviewed by Woodsman:
2002 Ford Ranger, 598,898 original miles. V6.
Amsoil Filter and Oil.
Still running strong.
Dirt bikes, tractor, and 3 other vehicles,......I never used an "additive".....only fluids going in my vehicles are AMSOIL!!!!!!
Reviewed by Old guy:
I replaced a leading brand with Amsoil because genuine lab tests demonstrated superior performance in our hot climate. It ,as a bonus stay's cleaner longer in my motorcycle and high performance boat and car engines than other synthetics and petroleum based oils, which makes for far less combustion made carbon and fuel contamination, the two main engine damaging agents that accumulate in the crankcase..
Reviewed by none:
When I went to all synthetic products on the motor home the transmission stopped slipping and my mileage also improved.
Reviewed by Ryan:
Bought this product for my lawn mower. Was a great replacement to regular oil. Performs great. Experiencing easier starts and more quiet performance. Exactly what I was expecting from amsoil.
Reviewed by H:
I use this oil from the 1st oil change 282,576 miles ago. No problem with the engine, it just goes and goes. We drive the car daily and for long distance and I never worry about the engine. I fully trust Amsoil.
Reviewed by Liz:
Smooth & starts well in all temperatures. thanks.
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Love this oil it's the best