I am going to try Valvoline Racing 20W-50 as mmerlin suggested. In my experience, the Castrol Edge 10W-30 is way too thin, even though the owner's manual says it should be fine. I will let you guys know if this solves the rattling issue.
Quote:
Originally Posted by Linderpat
Brian - I would never use Mobil 1 in my shark. Tried it once too, and it leaked out in spots in an otherwise leak free car. It is too thin, even at the 20W50 weight. Just awful for our cars.
I now use Royal Purple, but there are many other good choices out there too. Does NOT have to be synthetic; just have good zinc properties (ZDDP).
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Linderpat, I thought the viscosity for a given weight would be the same for both synthetic and dino. If this is not the case, perhaps the 10W-30 that the manual suggests is the dino weight (?)