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Hi Lagnakeil,
I must admit that when replacing the diff oil I spent ages deciding which oil to use.
The ROM only states EP90, but I think it is referring to GL4.
As no GL version is mentioned I assumed it would be GL1, but research led me to believe otherwise.
I "think" GL1 is not EP and only for use in vintage cars.
GL4 is mineral based and safe with yellow metals.
GL5 is probably superior to GL4,but is not safe with yellow metals.
I was not sure if the Stag diff contains yellow metals, so played it safe with GL4,
I used Comma 80W90 EP GL4, but I know that Castrol Classic do a GL4 EP 90 and (following good feedback on the forum), would probably use Miller EP90 GL4 now.
I think the main thing is not to mix GL4 & GL5.
If you are not sure what is currently in the diff, then remove the rear plate drain if fully and then refill with your oil of choice, but it must be EP.
Regards,
Den
Hello All,
Thankyou for your replies. I shall get some of the gl4 for the diff. It has been stripped, cleaned and rebuilt but no oil has been put in it yet. How much oil am I likely to need for a completely empty diff?
lagnakeil
It's interesting. There's been discussion on thr TR groups that GL5 is no longer bad to use in our gearboxes and Diffs. What's people's thoughts here ?
cheers
Tim
Thankyou for the capacities everyone, very helpful.
Hi Tim,
My preference is to play safe when it comes to oils. I had a discussion about engine oil and case hardening crankshafts. People believe that it is no longer as important to do this as the modern oils provide better protection.
the same applies to diffs. However, as I prefer to do things once, I stick with what was originally specified and only change if the original is no longer available.
It is personal choice at the end of the day.
Kind regards,
lagnakeil
There is an alternative. I use EP140 since appr. 25 years in my Stag diff. Why? I had the opporunity to discuss the oil subject with the head of the BP oil develop department in Hamburg. His recommendation for older diffs was EP140 oil as it is thicker than EP90 and reduces diff noices. And it does! The only requirement is to start and drive the car not below minus 10 C. But who does?
Klaus
It's interesting. There's been discussion on thr TR groups that GL5 is no longer bad to use in our gearboxes and Diffs. What's people's thoughts here ?
cheers
Tim
tricky one, if you care to try it out and cover the cost for a rebuild when the shims have worn out then fabulous.
From my perspective stick with what the manufacturer specified. after all you wouldn't pour a 0w/30 fully synthetic oil into your stag V8 would you? .... I hope
"Oh but that works on my brand new itchifani5000 eurobox and that doesn't leak nor use any oil between one service and the next."
See where I am coming from?
Stags and Range Rover Classics - I must be a loony
tricky one, if you care to try it out and cover the cost for a rebuild when the shims have worn out then fabulous.
From my perspective stick with what the manufacturer specified. after all you wouldn't pour a 0w/30 fully synthetic oil into your stag V8 would you? .... I hope
"Oh but that works on my brand new itchifani5000 eurobox and that doesn't leak nor use any oil between one service and the next."
See where I am coming from?
Am with you on this. No negative to using GL4 compared to GL5 so why would you risk it. Seems TR owners are willing to risk it.
There is a fabulous friction reducing agent marketed. It really works.
There are various brands available marketed under snake oil names & extremely expensive.
The basis is chlorinated paraffin…. And it’s amazing.
BUT during use , it turns oil into acid & eats copper based shims , washers , bushes etc.
One of the snake oil brands has published scientific test results that prove 100% that it doesn’t eat copper based items.
BUT the test was a static test = 100% fine if nothing is turning or getting hot!
I do use chlorinated paraffin…. Where no copper items are present.
All stag powertrain units have copper based items afaiaa. (Warning)
How can we tell what is used in modern lubricants?
If there is chlorinated paraffin used , it may caused increased wear to copper based parts.
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