Transmission oil change

Joined
Dec 10, 2019
Messages
28
Location
Croatia, Europe
Hi,
First car:
I'am thinking about changing oil in gearbox.
Car calls for GL4+ 75w85, so my question is if cars says GL4+ 75w85, am I allowed to use GL4 without + and am I allowed to use GL4/GL5 LS? What is the diffrence between that spec? What other gradation's of oil can I use?
Second car:
My older car (2002.) (by manual) needs 75w90 Tutela ZC 75 Synth, manual says it meets requirement of API GL5 again can I use GL4 OR GL4/GL5 LS?
 
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I vacuumed little bit of the oil from gearbox, and I supposed this is a little bit dirty?

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