Should I use Valvoline SynPower 5w-30 or 5w-40?
Hi Guys, I have a quick question with an upcoming Service B I am going to perform on my newly purchased 2006 C280 4MATIC. I have been reading the forums like a mad man and think I am pretty well coached as to what I am required to do and how to go about the various maintenance items (thanks to Service B sheet found on this forum and # of DYI threads). The only issue leaving me stumped is whether I can use Valvoline SynPower 5w-30 or 5w-40. At the moment Schucks (aka PartsAmerica) has 1QT of the above oil(s) for .99 AR. Unfortunately Schucks does not carry the MST version as prescribed by Mercedes — Found Here. From what I can see the Synpower MST has a 11.7 visc@100C versus the regular Synpower has 10.7 visc@100C. What adds to my confusion, according to Valvoline’s product info page ((Found Here), the SynPower 5W-40 is pending OEM approval for MB 229.51 which has closer specs to Mobil 1 0W-40 such as 14.5 visc@100C versus 14 visc@100C and 89 visc@40C versus 78.3 visc@40C, respectively
