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hello. i have 56 Triumph TRW 500 side valve. i was wondering what grade oil would be appropiate for the engine and primary case.
 

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Hi Rattrw and welcome to our ranks. The TRW is a bike to contemplate and will give you hours of fun but at it's own pace!
Engine oil; 5 US pints or 2.250 lts. 0 to 20 degrees F use SAE 10. 20 to 90 degrees F use SAE50.
Gearbox; 5/8 US pint or 300cc. Same temperature ranges, SAE 10 or SAE 50.
Primary chain case; 0.4 US pint or 200cc SAE 10.
You need to use straight grade MINERAL oil and try to avoid addatives in the primary case.
Roy.
 
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