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I've put two bottles of STP w/ZDDP in my two multifuel crankcases. One has Rotella Dino 15W/40, the other has Delo. I will report back any lab test findings, but that probably won't occur until next year. I've used Supertech synthetic in my Jeep TJ 4.0 and small engines (Briggs, Honda, HF)...

Just 41 hours on my sample, but if the Carnac's records are accurate, my engine only saw 38 miles of use after its 1985 rebuild. I'd like to think I'm "breaking it in." :driver:

This is what the military considers normal/abnormal, although its not clear to me how many hours were run on the engine to garner these results.. Attaching a recent report on my M109. Going by the above metrics I only seem high in lead and copper, which is an indicator of bearing wear...