I like that explanation on oil viscosity . Especially the part about oil shear of multi grade oils at high temp and what it does to the viscosity range. Good reason to have oil samples tested on heavy use engines that hold a lot of oil in the sump. Smaller engines, just dump it. One other thing, you can see how one particular 30 wt oil can be very close to the same viscosity as another 40wt oil if one is on the high side of viscosity range and other is on low. I think a lot of the multi-grade oils on the market fall into that category of just being over or under a line.
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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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