Those motors are really strong and oil leaks from the front right and rear right side are common without doing any overheating. If you have no coolant in the cylinders or loss of compression between cylinders or into cooling passages (pressurizes coolant tank while cold), then I would verify the straightness of the head and just replace the gasket if not out of tolerance. I would probably accept .004inlengthwise and .002 side to sde.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician