You need to read up on runaway Detroit 6-71's. That truck engine had problems. The freight line I drove for had 4 GMC 9500 series tractors with 6-71 Detroit diesels all running on Rotella 15-40 oil and ran great until taken out of service with 2-3 million miles on them ( engines were rebuilt several time in their life). Seems funny that you have had low oil presure with Rotela 15-40. All my old farm tractors and trucks run on it with no oil presure drop And the company that I worked for used it in 30 tractors ,5 straight trucks, 3 wreckers, 3 fork lifts and other company vehicles all running on Rotela 15-40. The only time you would see drop when hot was when engine was getting tired and ready for overhaul.
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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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