The German-made Castrol 0W30 is an excellent oil. I would use it without hesitation.
I am using Castrol 0w-30 Synthetic. The Castrol distribuitor here in my country has a Audi A4 and he recomend to use 0w-30 synthetic. This oil meet VW specs. My dealer also recomend the same.
I was running Mobil1 5W30 and switched to Castrol Syntec 5W50...I noticed 2 things...first, the engine became a lot quieter...less ping sound...secondly, the gas mileage went up...
On my car (1992 SLC VR6) on a 100 degree humid summer day, I see a max of 260 degree Farenheit on my oil temp display. I'm running Castol (non-synthetic) 20w-50w in the summer, but I switch to 5w-30w or any of the less expensive 5w-xx oils during the winter. I've been doing this for 5 years now, changing the oil & filter every 3000 miles, and so far, no problems.
i pay 8 bux a liter for Castrol TWS MotorSport 10w60 oil...so, that's like 42 bux (after tax) for 5 liters, then next change i'll pay like like 29ish for 4 liters...since i have a half liter or more leftover from the last change... then like 6 bux for OEM filter, drain plug and seal... so...48 bux/35 bux per change for me, just for oil & filter...
Surveys on several VW forums have Castrol 20w50 a clear winner for quality, price and availability, but other good brands like Valvoline, BP, Shell etc get honourable mentions too.
If you run it HARD than a 20/50 oil is good. I run castrol non synthetic, but I'm thinking of switching to Royal Purple. Still want to get more opinions before I do the change over but I heard good things about that brand.
I have decided to use Castrol GTX 5W-30.
For your hi-mileage IDI w/ 'consumption' fever, stick with the 15w-40, probably in a dino, and add a qt of synthetic same wieght same brand, at change You will get the lubricity of the snythetic for fraction of cost.
I'm currently using Castrol Syntec 5W-30.
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