Customer Ratings & Reviews

I have been using the signature series 5w-20 synthetic motor oil in my 2005 Dodge Ram 1500 (Hemi) since it was new and after 11 years it's still running strong.

I am a part time collage student getting my certification in auto mechanics, my engine seems to run quieter and the mileage has gone up maybe 1 or 2 mile.

The typical cold engine slap noise is gone. Oil pressure stays up after engine warms up and fuel mileage continues to climb. Do not hesitate to buy this oil. Mobil 1 isn't close!

I use this oil in both my car and truck. I like how I can schedule my oil changes during the nice weather seasons here in Idaho. I been changing the oil once a year without any issues. The oil always looks very clean and clear at changes.

I grew up in a family where good oil was the name of the game to keep your vehicle going for many miles. Just when you think the car is on it's last leg it will keep running and I believe it is due to the success of Amsoil products being used. If you are looking to only have to change your oil 2 times a year, once in the spring and once in the fall. I recommend you to buy this product. I have had great success with my vehicles and with Amsoils services.

We now use Amsoil 5w-20 Signature Series + Amsoil EA-Series Oil Filter on a 2004 Lincoln Towncar. Mixed driving mileage improved by 3 mpg over the OEM oil + filter, and highway mileage increased 5 mpg. The engine runs much smoother, particularly at idle. So far, the 5w-20 Signature Series has demonstrated itself to be of the same exemplary quality consistent with other grades of Amsoil Signature Series.

I have been using Amsoil in my vehicles since 2005. The money and time I save using the extended life filters and the quality of the oil is unsurpassed. I am glad Amsoil now has oil for my Dodge Ram 1500 Eco Diesel.

I only used AMSOIL products in my vehicles.

So far so good. Started using this as of 70,000 miles now at 110,000. I really like the once a year oil changes. I'd be interested in seeing an oil test.

I've been using Amsoil products for years so I am aware of the guilty and value, but what always surprise me, and I don't why by now, is the fact that they are usual at my door in 1 or 2 days. Fantastic shipping for me. I appreciate that greatly. Thank You Amsoil????

I have used this product in my 2012 Ford Explorer since I purchased it in February of 2012. I drive about 20,000 miles each year and it only change oil once a year. I have not had to add oil between changes.

I use AMSOIL like aircraft owners use engine oil on their planes. Auto owners change oil and filter every 3,000 miles or 3 months witch ever come 1st. With AMSOIL I change oil every 10,000 miles and filters every 5,000 miles. Easy to remember and cheaper than 3,000 mile or 3 months. Tell your wife not to nag you about oil change until she nears that 10,000 mile mark.

I have used this in my Toyota pick-up for 11years and the engine is like new.

I have used Amsoil for several years in just about all of my vehicles. The only one I do not use this oil in is an old 69 VW that leaks from time to time. For any other vehicle, old or new, I highly recommend Amsoil Sigature Series. I save about $100 a year per vehicle on oil changes. Once a year oil changes save a lot of time too. I've never had any issues mechanically with the extended oil changes.

I have been using this oil for over 20 years in all my vehicles. It is by far the best motor oil I have ever used. I started using in my 1996 Chevy pickup. The garage had to replace an intake manifold gasket. They ask me if I had cleaned the engine before bringing it in. I said no, they said the engine looked brand new inside, it had absolutely no carbon build up. That was amazing since the truck had 158,000 miles on it. You can't go wrong by using this oil.

Like the longevity.

I have been using Amsoil products over 20 years now and have been pleased with all the performance and durability aspects. Have used the Signature blend oils in many cars for the extended drain intervals and have never experienced any failure, wear or usage problems.... period. Why would I use anything else?

i was already using 0-20 in my Toyota and my Subaru, so I didn't really notice a difference in mileage. Oil analysis suggests the extended oil changes are easily doable, but I'll do another at 25000 to make me feel better. Swapping just the oil filter isn't bad at all........just not what I'm used to.

Put it in my 125K, 2005 Lexus RX 330, along with the Amsoil filter. Every thing fine so far. I'm looking forward to what the oil looks like in 10K miles. Actually, looks probably don't mean much. Would need to test.

i have used amsoil in my 2002 chevy avalanche with a 5.3 liter engine. i have 140,000 miles on the engine and oil consumption is less than a pint every 8,000 miles. i also use amsoil in my wifes 2003 chevy trailblazer, it has 121,000 miles and does not use any oil. i go 8,000 miles between oil changes. i also use amsoil synthhetic transmission fluid in both vechiles.