While cheap "insurance" I think you could extend your oil change interval without harming the engine... Traveling at speeds like that, I would take into account brake pad wear, especially if you have frequent hard or long stops scrubbing off lots of speed (vs a gradual coast down of speed)
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1976 914 2.0
2000 Boxster 2.7 (sold)
1978 911 SC (sold)
1970 914 w/2056 (sold)
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