Castrol Syn Gear Oil?

[y2k345]

Just wondering how good is it? Wanna put it in my half ton trucks.

 

[double vanos]

I use Castrol's Syntec GL-5 75/90 in my BMW mostly because it very closely matches the Castrol SAF-XO that it came with from the factory. Only holds one quart and goes 30k - comes out looking like new. This is in a BMW 330ci with a non posi diff.