When spun up on our test bench at 1,000 RPM, it reached a normal pressure of 400 PPSI. We rebuilt an A type overdrive unit and initially ran it with 30 weight non detergent motor oil. Many years ago (in a land far, far away (OK it wasn’t that far away or even that long ago)) we ran an experiment on overdrive oil. Some say to use multi grade oil (MG manuals), some hypoid oil (Triumph manuals), some non detergent oil and some even recommend automatic transmission fluid! No wonder everyone is so confused! Historically even the recommendations from various car manufacturers are confusing. This month’s discussion will invariably get some interesting responses as it seems to be a rather emotional (and not necessarily logical) discussion item for British car overdrive owners. We constantly get into discussions( and sometimes heated debates!) with British car owners on this subject. I want to express our experience and opinion on the topic of the proper oil for use in the Laycock de Normanville overdrive units. Gang – I apologize for not writing an article for some time, but between the rough winter and everything else going on, it was impossible! Topic of the month for June 2005 – Overdrive oil recommendation I "borrowed" this thread from the TR Forum, an article written by the quantumechanics guy, the overdrive "guru's" on this side of the pond.
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