Originally Posted by yagciogullari
Originally Posted by edyvw
That says to use 0W if temperature is below -25, dos not say not to use 0W30 if temperature is above -25. What would be a problem is if you use 0W20 or 5W20.
All W30 oils, ACEA C3, regardless whether they are 0W30 or 5W30 have similar KV100 performance (or more simplified: operating temperature performance).
Castrol 0W30 has hefty dosage of PAO base stock, and besides being very good in cold, it is excellent performer at operating temperatures. It is more sophisticated oil than Castrol Edge 5W30, Motul X-Clean or Shell ECT. It is ultimate Castrol's product for European market. Unfortunately, we in the US do not get that one.
thanks for the explanation.
one other thing though:
is PAO considered one of the top performers amongst synthetic oils? do Castrol Edge 5W30, Motul X-Clean or Shell ECT etc. have "inferior" base stocks?
First of al, always look at final product. Even if product has Group III base stock, which is considered as "fake" synthetic, final product could be of great performance (for example Mobil1 VISOM base stock).
Motul is Group III and SHell is GTL, but really do not know how much of GTL is in there. PAO is so called "true" synthetic. Now, Castrol 0W30 is not just great performer bcs. of PAO (for example Motul used for a long time PAO, but final product was not any better than average Group III based oils from Mobil1, SHell or Castrol etc.). It is generally great oil that provides good UOA all the time.