Slant 6- Idle and Running

RustyRatRod said

WD40 is useless in that capacity. It's not penetrating oil. In fact, it's not even a lubricant. Try Sea Foam Deep Creep.

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Yes I know this story, except for their penetrate version. For something that doesn't penetrate or lubricate, it does a surprising job at both though (the multi-use version).