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Rebuilt the engine. Ran fine for 100 miles then low oil pressure light comes on. Performed the following 3 steps which eliminated the light:

1. Changed oil filter. Concern of blockage due to failed turbo bearings. Found metal debris on CPS as evidence of debris - nothing else in oil.

2. Changed oil temp sender and pressure spring, positioned near filter housing from an 85K engine.

3. Changed oil. Concern that oil was too thin. I used a cup of Marvel Mystery Oil along with 5W-30 to help pump up the lifters on initial start up. Replaced with 10W30 per spec.
 
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