I am from Thailand, sorry about my bad english.
I doubting about this, changing oil interval, kind and Viscosity of oil.
Which choice is better, if main purpose is Engine protection ?
1. Fully Synthetic @ 8,000km/1-1.5yr(s) vs Semi Syntheic @ 5,000km/6-9months changings.
2. xW-40 vs xW-30...