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Hello-
If you mount it vertically, is there much use for a fan?
Yes. Vertically helps a lot for airflow, but so does the fan. In my own *informal* testing, it was ~15ºF more (the temp went up by about that much when my fan died once :-) ).
I find oil temps never really get that high unless cruising, at which time the airflow is plenty. Around town usually doen't raise the oil temps much.
Sustained rpm and, to a lesser extent, sustained load will kick the temps up. Cruising at 80-85mph wasn't in the original VW plan :-).
Take care,
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Shad Laws
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