I would think you were running at a lower RPM at the slower speeds? The pressure on the oil line will greatly effect the amount of leakage.
Where is the oil leak? If it is in the lines near the timing chains these should be easy to replace in an evening.
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David
'83 SC Targa (sold  ) MANLY babyblue honda '00 F250 7.3L (MINE!)
'15 F250 Gas (Her Baby) '95 993 (sold  )
I don't take scalps. I'm civilized like white man now, I shoot man in back.
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