Originally Posted By: Jeffs2006EvoIX
No intake valve problems on your VDubs running the GC? That's 502 so just curious.
Jeff
I use GC all the time last 30K. Now it has 58K, no issues.
What I can tell you is:
1. If i am doing several K in the mostly urban driving, the rpms in the morning during cold start are rough, and there is some oscilation.
If I run car hard, very hard, that will dissapear for some time.
Had one period where I did mostly highway driving, and no rough idle, no oscilation in rpms, everything was OK!
Now, I at least twice a month, go somewhere where I can push car to the limit for some time, and no issues with rpm oscilation in the morning etc.
2. GC i low volitaile oil compare to Castrol 5W40. It is MB 229.5 approved, which is very important in this case.
Personally, if you want to change oil every 5k, and want 504/507 oil, I think best way to go is PU 5W30, bcs it is heavy 30 weight (12cst) and HTHS is very high 3.68 (sam as old PU 5W40 SM).