I worked for a company the shop foreman would only use 15-40 in all engines. The company bought 5 new 2007 Chevys with 6.0 engines they did all the oil changes at 3000 miles and all 5 of the trucks within 100000 miles either had to have new engines or oil pumps. The head tech found out from GM that the oil pump was positioned different on these newer engines and the heaver oil would not pick up correctly on cold start up and thus starved for a few seconds every start. After a few more costly moves like this the foreman was fired and they use the correct oil on all there newer trucks with no issues. John
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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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