E diff oil is genuine LR only☹️
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I purchased online from Sparesbox to get the exact Castrol freely delivered to my door. If you're not in a rush it's a great source of stuff.
I have not looks.at.D3 spec. I purchased Penrite Pro Synthetic gear oil for my D2. Not cheap but the original 320,000 diffs should be treated to a nice bath.
Cheers
I use penrite 75w90 progear in d3/4 diffs. Genuine transfer case fluid, and lifeguard in the trans.
Jc
I gave up on synthetic diff oil about 100,000ks ago . I change my diff oil every 10,000ks and am happy to do it that way then try and get more Ks out of a synthetic oil.
Not for everyone but im happy using it.
Cheers Ean
Thanks for the comments - I will give the Penrite a go.
Ean - I would have thought that with its small 600ml capacity, synthetic would have been perfect for the front diff. So why do you think normal mineral oil is better?
Cheers
Garry
Despite the cost, I'd only use synthetic even if I change it more regularly. But that's me.