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.
I have a 450k km 1.9 tdi, and a 300k km 1.6 tdi, i always use 5w30 castrol, no issue.
I really liked Valvoline, good quality, reasonble price.
Valvoline Restore & Protect or Pennzoil Ultra Platinum are also great oils to run and clear up and baked on sludge.
I would only suggest using \"premium\" oil brands, like Castrol or Elf, in correct specification.
Buy Valvoline oil, and maybe it's a good time to switch to 5w-30 in it.
Castrol Power1 is really good though
My last [Blackstone-labs.com](http://Blackstone-labs.com) report came back with 1.8% fuel dilution. 2021 1.5T at 23kmiles, 6800 miles on the oil (0w20 Valvoline R&P).
I use that Valvoline, sometimes throw in random fully synthetic oils I get in bulk from an auction. I feel like it contributed to a rear main seal leak. Thinking of switching to a 5w40
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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 VALVOLINE.
In March 2026 on PartReview, engine oil Castrol were overall more popular than VALVOLINE.
By vote balance, engine oil Castrol surpassed VALVOLINE:
By number of reviews, engine oil Castrol surpassed VALVOLINE:
In March 2026, according to PartReview, engine oil Castrol led more car-specific ratings than VALVOLINE:
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.
VALVOLINE are chosen by owners of cars such as: Ford Fusion, Hyundai Elantra, Kia Soul, Toyota Prius, Toyota Yaris, 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, AMSOIL, PENNZOIL, RED LINE, OEM Toyota, Mannol, RAVENOL.
Also available: comparisons of engine oil VALVOLINE with: Mobil, LIQUI MOLY, MOTUL, Shell, AMSOIL, 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.
