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Old 3rd November 2019
Jollly Rogers Jollly Rogers is offline
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GM used those washers on oil pan drain plugs in the 90s and 2000s. Then they added a groove in the washer head of the bolt for a modified o-ring. The pictured seal washers can get torn up by over torquing and uneven surfaces they contact. Burrs where the surface is tapped for threads should be checked for and removed.
Joe
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