What type of oil can I put to the manual transmission of my car?

Question:
the manufacturer (KIA) specifies to use a 75w90 API GL-4 oil in the manual transmission of my RIO but I can´t get the API GL-4 SPEC, is there something I can add to my transmission?
I already tried castrol syntetic 75w90 API GL-5, the first 3 days works perfect but it degrades itself after that.
So what can I use for my transmission?
thanks

Answers:

Torque specs for 96 ford mustang 3.8 head bolts??

go to a fast lube shop, i know jiffy lube still carries pennzoil gl 4 and synthetic gl 4

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How do i get an estimate for a pain job for my car?

try rapeseed oil or sunflower

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New tires with sidewall cracking?

Castrol synthetic degrades,, in a manual transmission? that sounds highly inprobable. API: American Petrolium Institute GL-5 rating is a higher standard GL-4. The stuff you got in there should be fine.

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I just blew the engine of my 2000 Audi A4. How much should I be able to junk it for?

Any name brand 80-90 EP (Extreme Pressure) oil will work. It's just an advertising gimmick.

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Small screw - head over torqued, hence destroyed head slots. How can I get the damn thing out?

Brake Fluid!! DOT 3

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