Author Topic: Help I have an Oil Leak!!!!!  (Read 2670 times)

Online Brian

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Re: Help I have an Oil Leak!!!!!
« Reply #15 on: 20.06. 2010 09:18 »
I have aways used EP 80-90 gear oil in my gearboxes and have never had a problem. These oils are designed for automotive gearboxes that have contained Bronze synchro rings since they were invented.

Offline MG

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Re: Help I have an Oil Leak!!!!!
« Reply #16 on: 20.06. 2010 09:31 »
Yep, but not the GL5 spec oils that were designed for the rear axle gears. These can cause problems, so be careful!
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Online Rocket Racer

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Re: Help I have an Oil Leak!!!!!
« Reply #17 on: 21.06. 2010 06:47 »
That's really interesting, I had a look at the several empty gearbox oil containers I had and both were marked as GL5.
I also have a container of motul gearbox oil (for a guzzi I used to own) that contained molybenum for the load in the diff and that had both the notations GL4 and GL5.

In my plunger B series that runs straight 50 in the engine, I've always just run 30/40 over the last 25 years.
Apologies for hi jacking this thread that was about oil leaks!


Yep, but not the GL5 spec oils that were designed for the rear axle gears. These can cause problems, so be careful!
A good rider periodically checks all nuts and bolts with a spanner to see that they are tight - Instruction Manual for BSA B series, p46, para 2.
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Offline BSA_54A10

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Re: Help I have an Oil Leak!!!!!
« Reply #18 on: 21.06. 2010 12:21 »
When the only boxes with syncro were on Rolls Royces & Caddies then  corrosion ( also errosion ) was a problem.
However syncro is now standard on just about everything and the bulk of syncro cones are brass.
So just about any modern box oil will be safe in out boxes
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Trevor