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1. Clean engine of all built up grunge, top & bottom - fin clogging can reduce cooling effect. Good threads on how to do this.
2. After a spirited drive , get under the engine at night with a strong torch and look carefully for seapage e.g. oil return tubes etc etc
3. Get the comp & leakdown to assess how old this engine is - with diagnosis you can plan for treatment
btw what type/weight of oil are you using?
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'81 924 , '85 944 , '78 911SC , '82 928 5.0L
"They run best being run close to the ‘limit’ and done so regularly" - Grady
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