Dear Phaeton friends, was recently in oil change, wanted to have 10W40. The car is from 2005, 250000km.V6 The mechanic said we fill in 0w30, so it stands here in the PC, only this is allowed.In the operating instructions of the Phaeton it says: VW 50501. If you are looking for it you always find 5w40. Is the 0w30 not too thin for an old engine? Should I replace it? What should I refill, also 5w30 or 5w40? Mfg gp