Join Date: Mar 2007
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Yes, Same oil in the transmission as in the crankcase for 1GM, 2GM and 3GM.
However, if you are in a temperate climate, the transmission will be fine with a straight 30W oil (properly rated.) I mention this, because the transmission oil usually does not need to be changed as often as the crankcase oil. So if you use 15-40 or 20-50 crankcase oil during your hot season, and change over to a 10-30 during your cold season, you would be probably be fine just going with a straight 30W in your transmission the entire time. The transmission will be warmed somewhat by/during engine warm-up, so it is not as critical to have a multi-weight oil for cold-weather starts.
That said, a 15W-40 works well in both the crankcase and transmission for the temperature ranges in which most of us typically sail.
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Pacific Seacraft Crealock 31 #62
NEVER CALLS CRUISINGDAD BACK....CAN"T TAKE THE ACCENT