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hey boys just wondering what diff oil everyone recommends to suit a 9inch 4:11 full spool and are any additives required? its only a mildly worked street car. Any help would be greatly appreciated 

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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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Outback Jack likes this

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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 

CHESTNUTXE and Slow250XC like this

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