Redline Gearbox and Differential oil

[Bahamayellow]

I have read through the posts and opted a while ago to use Redline Diff oil and stuck with a top up of the gearbox with Hypoid Castrol gearbox. After reading the reviews I have decided to drain the gearbox completely and go with MTL in the gearbox bur can anyone advise whether I need to flush the gearbox or does the redline MTL mix compatibly with whatever remnants of the Hypoid oil left in the gearbox.

Thanks
Mike

[661]

I'm not aware of incompatibility.
You could put a splash in with the drain still open to flush virtually the last of the other oil out, but to my mind I would just get on with the new oil once the gearbox has been drained fully.

[StressCraxx]

I have done it. Compatibility is a non-issue.