quote:
Originally posted by Alex D:
Mercury only recommends their 20W-40 Mercruiser oil, which is really not all that good. We know the add pack in this oil is no better than HDEO oils, but is has no VI improvers.
They recommend straight 30 weight or 20W-50 if their oil is not available.
Clearly their fear is primary of VI enhancer shear and subsequent sludge forming.
This is really no cocnerns of mine with modern HDEO oils like the ones listed here. I don't want straight weight or heavy 20W-50 for my application. I think they are too heavy and too thick.