In the summer use 30W, in the winter use 10W30. DO NOT USE NONDETERGENT OIL.
Phosphate is the replacement to zinc as I recall... and is not quite as good performance wise as Zinc, but is close on metal to metal protection. The lack of zinc is an issue with metal to bronze. Zinc has been lowered to about 1/3 of the amount in SM rated oils compared to previous off the shelf oils. If you find SJ rated oils on the shelf no problem at all.
Even the current SM rated oil is still much better than the nondetergent oil that manufacturers recommended in the early 80s and earlier - it contained no zinc at all.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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