Castrol EDGE Euro is also VW 508 spec.
The mechanic is absolutely wrong. You must use a 5W-40 C3 oil with the Fiat 9.55535-S2 specification, I use the Castrol Magnatec 5W-40 C3, which is cheap and easy to find, but any other brand with the correct specification is fine. A 0W-20 oil has insufficient pressure and film strength, and will lead to damage over time.
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 a 450k km 1.9 tdi, and a 300k km 1.6 tdi, i always use 5w30 castrol, no issue.
I would only suggest using \"premium\" oil brands, like Castrol or Elf, in correct specification.
Castrol Power1 is really good though
I change the oil myself...to ensure it's done correctly and with quality oil (I use Castrol Edge). And I go by the oil minder. I do smell gas during oil changes but it's not strong and never in the cabin between oil changes as some have reported.
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.
Get a catch can but that mobile 1 oil you are using is for shit . Amsoil is best for mustangs and the best for that matter period it\u2019s cost but you can run it 25k
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If choosing engine oil across many manufacturers, check the part ranking. If your choice is down to two brands, the PartReview part comparisons help.
We compare engine oil across these categories:
In March 2026 on PartReview, engine oil Castrol were overall better than AMSOIL.
In March 2026 on PartReview, engine oil Castrol were overall more popular than AMSOIL.
By vote balance, engine oil Castrol surpassed AMSOIL:
By number of reviews, engine oil Castrol surpassed AMSOIL:
In March 2026, according to PartReview, engine oil Castrol led more car-specific ratings than AMSOIL:
Castrol are chosen by owners of cars such as: Skoda Octavia, Audi A6, Audi A7, Audi TT RS, Ford Explorer, Volkswagen Beetle, Volkswagen Corrado, 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 Castrol with: Mobil, LIQUI MOLY, MOTUL, Shell, VALVOLINE, PENNZOIL, RED LINE, OEM Toyota, Mannol, RAVENOL.
Also available: comparisons of engine oil AMSOIL with: Mobil, LIQUI MOLY, MOTUL, 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.
