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You really can't go wrong with a good quality full synthetic gear oil. Expensive but worth it, at about $30 a litre. Castrol Syntrax 75W90 is what we used in the Falcon one-tonners that were having diff issues. Once we started dumping the factory mineral oil and replacing with this stuff, the diffs were living a lot longer. Synthetics cool better as they seem to be thinner and flow more nicely for the same amount of protection.

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I'm running https://www.penriteoil.com.au/products/gear-box-oil-30  .... not sure why people run such heavy oils these days, that's like from the 60's, just run this and change it every few years, it's like 20W-60W which is ok, just give it some time to warm up and it will quiet as it warms up, I like it

some of the 90W oil is just fucking stupid, if you'd be drag racing it I'd probably just run ATF and change it every few months 

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