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ENGINE CLINIC — After-run Oil Mystery Engines & More!
This past month, several readers brought to my attention that my name was being kicked around on an online forum regarding whether Mobil 1 could be used as an after run oil in YS and O.S. engines. As those who own YS or O.S. engines know, petroleum-based after-run oil should not be used due to incompatibility with the silicone rubber diaphragm in the YS pressure regulator and O.S. pump. Petroleum-based oil will turn silicone rubber...
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