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PostPosted: Sun Jun 17, 2018 3:16 pm 
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Joined: Mon May 09, 2016 11:39 am
Posts: 28
Hi all

The gearbox in my car is a works Option 1 box out of a 240RS that uses the Porsche-style synchros. Are there any caveats or restrictions on gearbox oil grade and type? My googling hasn't helped me on this one.

Thanks!
Duncan


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PostPosted: Sun Jun 17, 2018 3:48 pm 
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Location: Adelaide.
"Transmissions with brass synchronizer components are generally not suitable for use with GL-5 specification oil unless specifically stated by the manufacturer as the extreme pressure (EP) additives in the oil are corrosive to brass and bronze components at high temperatures and decrease the synchronizer effectiveness at low temperatures. The additives in GL-5 oil also cause physical damage to brass synchronizers as the EP additives bond more strongly to the brass than the brass does to itself, causing a small layer of brass to be worn off with every gear change.[6][7] Instead, oil which meets only the GL-4 specification should be used whenever possible."

https://en.wikipedia.org/wiki/Manual_tr ... ynchromesh

;)

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PostPosted: Sun Jun 17, 2018 7:31 pm 
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Joined: Mon May 09, 2016 11:39 am
Posts: 28
Good point - I'd forgotten about that (I have a 1941 Fordson Model N tractor whose gearbox is full of phosphor bronze bushings so finding modern gearbox oil that was suitable in the ludicrous quantity needed was a nightmare)

Porsche-style synchros are steel so should be good with either spec but I want to be sure so more checking needed...

Incidentally, found this: https://www.jdmjunkies.ch/wordpress/201 ... billities/


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PostPosted: Thu Jun 21, 2018 7:05 pm 
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Joined: Mon May 09, 2016 11:39 am
Posts: 28
... and here's the answer:

You can use either 75W 90 Castrol Syntrax or 75W 90 Pro Gear by Penrite Synthetic


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