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But failure of that o ring usually only causes lack or loss of OP. Will not lead to an external leak. Failure of gasket at the oil pan is high % especially if the cover bolts are not torqued correctly and one other little thing, the gasket usually sticks out on both sides on the bottom, the excess should carefully be removed. Another one of those factory school hints. Earlier round motors had a more forgiving OPan gasket, but it could still induce a leak over time. Newer no gasket and new gaskets seem to be more prone to leak issues when the front cover gasket isn't trimmed.
Some where someone said they don't use a torque wrench except for a couple of places. I was able to do that also with everything pre 93. With the FD and Renesis I use them on just about everything. Too much work involved to have something silly go wrong. Doesn't really take you that much longer.
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