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.
Prolube is trash used motul and my top speed increased by almost 10 on all gears on my d250
I've been running 8100 Power 5w30 for the last two changes, every 3000 miles, and the aced the initial Blackstone test.
I've been using the x-clean EFE every 3k miles forever now an am tuned on full e85 now for 30k miles besides the factory valve tube seal leaking they fixed at 14k miles once but that's due to 23' errors. Now am thinking did I use the wrong one hahaha but am 30k miles deep in my use never anything oil that the efe in mine.
I have Signature in my 25. Smoothed out the engine noises quite a bit.
Using Motul (8100 5w-40 initially then 0W-40) since 8 years in my Honda City '09 and I replace engine oil myself every year. Engine is smooth and gives decent mileage. Never faced any issues
Upping your oil change intervals to 5000kms wouldn't be a bad idea. I use motul 5w40 and haven't had issues
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.
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.
Could be the oil and not any problem with the engine itself. In India, these engines come with Motul 7100 full synthetic oil. There have been some discussions on the 390Duke forums and on Reddit that the oil burning issue and high oil consumption is caused by using Motul 7100
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In March 2026 on PartReview, engine oil MOTUL were overall better than AMSOIL.
In March 2026 on PartReview, engine oil MOTUL were overall more popular than AMSOIL.
By vote balance, engine oil MOTUL surpassed AMSOIL:
By number of reviews, engine oil MOTUL surpassed AMSOIL:
In March 2026, according to PartReview, engine oil MOTUL led more car-specific ratings than AMSOIL:
MOTUL are chosen by owners of cars such as: BMW X3, Renault Megane, Audi TT, and others.
AMSOIL are chosen by owners of cars such as: Honda S2000, Toyota 4runner, and others.
If this comparison didn’t fully answer your question, there are many others on PartReview.
For example, comparisons of engine oil MOTUL with: Mobil, Castrol, LIQUI MOLY, Shell, VALVOLINE, PENNZOIL, RED LINE, OEM Toyota, Mannol, RAVENOL.
Also available: comparisons of engine oil AMSOIL with: Mobil, Castrol, LIQUI MOLY, Shell, VALVOLINE, PENNZOIL, RED LINE, OEM Toyota, Mannol, RAVENOL.
You can also see who is better among other engine oil manufacturers: Mobil or Castrol, Mobil or LIQUI MOLY, Mobil or MOTUL, Mobil or Shell, LIQUI MOLY or Castrol.
