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You might also want to check the oil breather box seal. These tend to bake real hard over a period of time and you can get a slow weep/leak onto the back of the block which might drip down to the back of the engine. Usually not a big leak, more of a weep. O ring only costs about $1 to replace, although removal of the breather box might take an hour or so. A poor seal here also reduces the effectiveness of the breather system which can cause leaks elsewhere to get worse. If this is a turbo, the seals under the oil filter adaptor also tend to get hard and leak. Again, a couple of $$s for the parts and an hour or so of labor.
Distributor seals may start to leak anytime from 75k miles upward in my experience.
Good luck,
Kevin
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Current: '95 945, 98k miles; '90 BMW 325i, 95k miles. Former Volvos, gone but not forgotten '85 245, 250k miles; '91 744T, 150k miles
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