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Discussion Starter #1
What's the best gear oil for a 6 speed with Q2?

The reason why I ask is because I was at the point of purchasing a fully synthetic, GL5 gear oil from Castrol, 75W90, which said "For use in all gearboxes and transaxles that do not use limited slip differentials".:(

So... Why can't I use this and what can I then use? Please state Castrol if possible as I'm in South Africa and we may not have the other gear oils available locally.:rolleyes:
 

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The mention of LSD is that most use friction.
That doesn't apply to Torsen/Q2 type diffs.

But isn't the GTV box spec'd with GL4, not GL5?


If it was mine I'd use Redline MT90.
 

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Discussion Starter #3
If I use GL5 instead of GL4 will it be detrimental?
GL5 oils are all thinner when colder despite the 75W rating of all of them.
 

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Discussion Starter #6
What does the owner's manual specify for the Diesel GT with Q2? I need to buy the oil and deliver it this morning...
 

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What does the owner's manual specify for the Diesel GT with Q2?
Selenia "TUTELA CAR TECHNYX"
Synthetic-based oil, grade SAE 75W-85
that passes API GL-4 PLUS, FIAT 9.55550

Same as non-Q2.
 
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