Some of the Stude engines I have rebuilt have been a mess- worn lifters (severe pitting) and cam lobes. I attribute these worn engines to having been in cars that previously were "just an old car" and thus not taken care of, and all of these engines had sludge in the pans and every crevice. As a comparison, I pulled the heads off of my '99 F150 (blown spark plug and ruined head) with 100,000 miles on it. I change the oil about every 3,000 miles, and the engine was almost spotless even up in the cam area. I also could see factory hone marks in the cylinder bores! The new (used) head that I sent to the machine shop had sludge in the cam area, and varnish on the tappets. Obviously neglect may have been why that head came from a junk yard.
I am now adding STP (contains an unknown amout of zinc) to my Studes at each oil change, as I do drive them at prolonged freeway speeds in the summer. I feel this is cheap insurance against premature wear,but not as important as regular oil changes.
I am now adding STP (contains an unknown amout of zinc) to my Studes at each oil change, as I do drive them at prolonged freeway speeds in the summer. I feel this is cheap insurance against premature wear,but not as important as regular oil changes.
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