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Gearbox oil change

Posted: 13 Sep 2024, 15:01
by Reco
Hi -not been on here for a while but hopefully some simple advice needed please.

Changing my gearbox oil - I've drained usual dark stinky oil out.
Opened new oil (Comma SX75w-90 GL4 semi-syth - researched on here to be correct) but this is practically clear!? (I mean clear like water)

Is this right or have I misread recommended oil specification?  And will it be ok mixing with old stuff still in the box?
(Previous research found 4.5lts +/- capacity but only about 3 litres will drain with box still on the motor.)

Nothings ever simple..