1000 votes
Fellow mu-X owner here! If you're thinking about upgrading from the standard Isuzu Genuine Motor Oil 10W-30, check out the ZIC X7 Diesel 10W-30 Fully synthetic. I used Amsoil Turbo Truck 5w40 too (10k km interval) but it's expensive for my Garage queen mux haha. Mobil Delvac1 5W-40 is good as well.
I have Signature in my 25. Smoothed out the engine noises quite a bit.
My biggest regret, not swapping out the shitty 0w-20 factory filled oil for some 5w-30 Amsoil, Motul, or Pennzoil Ultra platinum the moment I took it home. Don\u2019t wait till 1k miles.
Engine noise is a little, well noisy, mine is less rumbly/vibrationy after I changed my oil and used Amsoil Hybrid oil. I can’t generally feel anything when the engine kicks on now, before I could definitely feel it every time it kicked on.
I switched oil to AMSOIL signature series synthetic, from everything I read, it out performs other oils, used to use Mobil 1
My 2016 GT350R has almost 25K miles and has never needed oil between changes. I use Amsoil every 5000 miles, sooner depending on track abuse.
Amsoil 100%, I tested it quite a few, and I’m noticed the least amount of decoration and power loss with it
5w30 Amsoil, ignore the tick it's normal.
Amsoil engine oil
Also, I have upgraded to Amsoil Synthetic Engine Oil which further helps for maintaining DPF health as it reduces ash that can accumulate and plug the filter.
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The brand is registered in USA. Official website: https://www.amsoil.com.
In March 2026, PartReview users have a positive opinion of AMSOIL engine oil.
PR Score — 93 out of 100, based on 328 reviews and 999 votes. 300 positive reviews, 15 neutral reviews, 13 negative reviews. Average rating — 4.5 (out of 5). Vote balance: 930 up, 69 down.
In the ranking of the best engine oil this part is at position 6, behind MOTUL and Shell , but ahead of VALVOLINE and PENNZOIL.
Users also evaluated the qualities of AMSOIL engine oil:
See which car brands and models owners choose AMSOIL engine oil for. Below are car-specific ratings where this part is in the Top-3:
There are 31 comparison of AMSOIL engine oil with other manufacturers on PartReview.
In particular, see which engine oil are better: AMSOIL or OEM FORD, AMSOIL or Lucas, AMSOIL or Motorcraft, AMSOIL or OEM Audi, Kendall or AMSOIL .
