A short update on the question of OD oils.
I have consulted the local Mobil technical office for a list of
recommended oils for cars equipped with manual gearboxes with
Laycock de Normanville ODs. (For referrence, I've put the corresponding
Mobil product name in parenthesis):
Volvo: Auto Gear oil, ATF type F or G (ATF-210)
Jaguar XJ3.4/4.2: Gear oil GL5 (Synthetic gear oil GL5)
Triumph: Gear oil GL4 (Synthetic gear oil GL4)
MG: Motor oil (Mobil 1)
Range Rover: Motor oil (Mobil 1)
It would almost seem like "anything goes".
A few additional notes for those who want do go their own ways:
* Auto gear oils are used to make gearing easy in very cold weather. It
might increase the noise level somewhat, though.
* On some old gearboxes, GL5 may attack bronze syncros etc. Use GL4.
* Additives and oils especially formulated for Limited Slip differentials
should be avoided in gearboxes. Again, GL4 should be safe.
* GL5 spec is preferred for hypoid differentials, although GL4 is
probably good enough. Never use engine or ATF oil.
* Although no formal specification exists, engine oil would be
roughly equivalent to GL3-spec gearoil when used in gearboxes.
I hope not to have added further to the confusion!
Egil
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Email: egilk@oslonett.no Voice: +47 22523641/92022780 Fax: +47 22525899
Smail: Egil Kvaleberg, Husebybakken 14A, 0379 Oslo, Norway
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