Interesting. I think your onto it Arthur. Explains the leak then no leak. And if one wanted to diagnostically make it leak one would put a half quart of oil in there, go for a run and park it again. Then it should leak if its leaking at the gasket. If no leak them perhaps not a bad gasket. Brilliant. I'll try it!

Thanks!

Now, one more question. If it does leak when really full, but does not leak when at halfway mark, would you say go ahead and change the head gasket immediately or run it until it gets worse? Keeping an eye on the usual things like Antifreeze use and Oil contamination or Antifreeze contamination of course.

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1983 300D-Turbo - Deep Blue w Palomino MB Tex (total loss in fire 1/5/09 RIP)
1995 E320 W124 Polar White/Grey Mushroom MB Tex
2005 F150 Supercrew - Arizona Beige - Lear topper
1985 Piaggio Vespa T5 - Black and Chrome

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