Thanks for the great article!
I'm in a dilemma, my oil change is due. I wanted to buy 5W-30 for my Beat TCDi as the specification says, and the guy there gives me 10W-40 Semi-S and I ask for a lower cold viscosity (Back then I didn't realize I wanted 5W-30). He has mineral oil for that viscosity, so I take the Semi-Synthetic for me. When I now read the manual and came to know about the hot viscosity thing, I called my trusted mech, he said that Semi-Synthetic's 10W-40 is BETTER than Mineral Oil's 5W-40. Is this true?
Thanks!