Tried this once and have never stopped. 0w40 isn't offered by most or is tough to find. Amsoil is the only oil I trust and have not had any mechanical issues whatsoever.

I am not exactly sure how many miles I put on, but i do drive a great deal. I am in the healthcare field in a very rural environment. I need my car to run well and I do not have time for frequent oil changes. Does this oil last for 25,000 miles or one year? I should be more attentive and be able to give a more definite answer, but I will say that with the driving I put on my car (2009 Suzuki SX4) in all kinds of weather, where things are often between 1 and 3 hours between points A and B, the oil lasts a good 9 months before it even begins to break down. I meant to change the oil about a month ago (11 months between changes), but we got hit with major wildfires that put a real damper on all activities. The car is still running great, and the oil will get done this week. This oil i definitely worth a try. I suggest giving it a shot, monitoring your oil and seeing how this performs in your conditions, wherever you are, and do better than me by minding your mileage. Then you have a good idea if it is worth the investment. The Signature Series grade has worked for me, especially when the Amzoil filter is available (Amzoil was out of stock his time around on the filter).

Best oil I've ever found. Been using it for 20 plus years. Use it in everything, from vehicles to lawn mowers. Nothing better.......

Amsoil best products available

Another great Amsoil product.

Using it in my kids sports car. Not outta storage yet. Sure it will be great.

At 72,000 miles, this was my first install of the Amsoil product. Before that I had noticed a Tick, Tick, Tick noise when my engine was idling, but after changing the oil that went away. The only issue I have is that they tell you to change their filter once a year which seems a little nebulous since they don't know how many miles you drive. So, if the oil will last you up to 25K, and you only drive 15K a year, You will have to add a half a quart or so every time you change the filter .

This oil is the only oil I put in my 2015 Chevy SS. High reving 6.2 v-8. I feel very confident in this oil when I put the car through its paces that it's protecting and lubricating all those bearings and surfaces. Engine takes 8 qts. Expensive, but when you own a little rocket like this car, it's worth it. As I add more power to this car, I'll continue to use this awesome oil. Thanks!

This is the best synthetic I have tried. Definitely the best when changing over in higher mileage engines. It will cause no problems, and you will gain all the benefits of moving to synthetic.

Came faster then delivery date nicely boxed up thanks again

Love Amsoil full synthetic in my Gen 6 Subaru XT 2.4 Turbo.

I have been using Amsoil for a number of years. It is nice to have the extended oil change interval as well as having the best engine protection from wear available. I've put on over 200,000 miles on several vehicles with no engine issues.

92,000 miles and the only oil I have ever used.

First oil change in my new Motorhome. Only had 1500 Miles, but I had to get the mystery oil replaced.

Amsoil is the only oil I’ll run in my Ecoboost F150 and my Harley (not this weight).

I have been using Amsoil since 1975.

I have been using Amsoil for more than 10 years and it always lives up to my expectations. I run this 5w20 in my 2018 F150 Coyote. My only gripe is that the price keeps going up on all products, every time I get ready to reorder, it seems like they have gone up again.

It's really hot at this location in Southeast, Texas. This oil is now in a 2007 Tahoe with 120,000 + miles. There has been an slight clacking in the motor since I got it with 80,000 miles. When I put Amsoil, Synthetic, SAE 5W-30, in about 5 minutes the clacking stopped. So, I must say THANK YOU.

I’ve been using this oil for years on my farm trucks and my ‘04 Cobra mustang. Amsoil takes the heat and rough enviroment and sometimes prolonged oil changes with ease. Is there any better?

Car runs extremely smooth and gets better mpg’s.