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Registered
Join Date: Apr 2000
Location: Exeter, CA, USA
Posts: 165
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When Syntec first came out, I changed the oil from regular Castrol to Syntec. The only weight available at that time was 5w50. Leaks followed the oil change. I changed back to regular "Dino" and have not had any problems. I do use Valvoline 20W50 VR-1 racing motor oil now due to the increased amount of ZDDP over regular motor oil.
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