OILS FOR B21

[K Walton]

Having only recently obtained the bike I don't know how long the oil has been in the engine , gearbox and primary  chain case. As the only reference i can find for recommended oils is Castrol XL or equivalent, it doesn't mention the grade, can anyone advise.
Thanks

[Greenfield]

Go for a good quality classic oil. You won't go far wrong with Castrol XXL40. Use it in engine, gearbox and primary drive.

[K Walton]

Thanks, I'll go and get some

[Mark Cook]

Another option https://pesltd.uk/?product=GF40

Mark