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quote wrenchero:
how about older qd engines with bushings instead of bearings
I believe the spec on the older QDs is 24 to 1. I use 20 to 1 in mine. Convenient to drop a quart of oil in a 5 gallon can for 20 to 1 and a bit more oil in those can’t hurt. When I put an old QD on my grandson’s hydroplane, I double the oil, using 10 to 1 because of the higher RPMs