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Mulitgrade Oil
As the season draws to a close I am thinking about fluid changes in my new
to me boat. I have 1987 Mercruiser 260s and the manual recommends straight 30W oil. Why not a 20-40W or a 20-50W? The manual says that's ok if straight weight is not available but it is not recommended. Can anyone shed any light on this for me? Thanks.-DanO |