You really mustn't mix mineral and synth oils, but otherwise pretty much anything goes.
You especially shouldn't put mineral oil in a jet engine desinged to run on synthetic...

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MC21SP Plaything
BMW F800GS Bumblebee
Triumph 9551 Daytona Big boys toy
FJ1100 Sporting relic
GTS1000 oddball

Last edited by Dave Ett on Tue Jan 23, 2007 4:16 pm; edited 1 time in total