Diff oil

[Drew SS]

Guys I've just rebuilt my diff I've 3.9 gearing in it and a tru trac centre I've been told to get 75w/140 fully synthetic oil for it so done that but just looking at what I got it will suit limited slip diffs as well but isn't for it if you no what I mean can someone tell me is this oil ok to use thanks Andy

Edited by Drew SS on Saturday 21st June 15:57

[VinceM]

If it's a Monaro then it's the right spec however I'm not sure if the requirements change as a result of the new diff being fitted?

Eurol are a fairly cheap brand, I used Castrol Syntrax in mine (standard VXR diff).

[jameshsv]

Isnt it a different oil for the true trak!

[Drew SS]

Cheap well I thought 22 euro a litre was expensive enough and that's trade price yeah see my problem is it dosent say it's for a limited slip diff on the front which is ok but on the back it says it can be used for one which that's why I'm hesitante to use it

[VinceM]

API GL5 means it can normally be used i limited slip diffs.

I'd be inclined to contact the diff manufacturer though to check which oil you need.

I paid about £35 for 2 litres of the Castrol stuff.

[TheLeatherman]

I went with the 140 grade of the following just a few weeks ago when I serviced the Monaro:

http://www.opieoils.co.uk/p-69354-gulf-competition...

So far so good. It definitely hasn't made the LSD too slippery if you know what I mean. I got mine from Opie Oils, who were excellent for service. But it is running in a 3.9 Holden LSD set up, not a tru-trac. I did have a tru-trac in a 9 inch diff and it was very smooth and controllable.

In Oz we always used penrite limited slip 140 with the LSD additives, but it's not available over here after repeated attempts to get it.

[ARAF]

TheLeatherman said:

In Oz we always used penrite limited slip 140 with the LSD additives, but it's not available over here after repeated attempts to get it.

Have Penrite UK told you that, or is it that you can't find it stocked anywhere?

http://www.penriteoil.com.au/uk_locator.php

[TheLeatherman]

Yeah I spoke to the guys at Penrite UK - not a stock item for them unfortunately - or so I was told!!!!

[MyM8V8]

Trutrac advise not to use an oil with friction modifiers.

The grade (75W140) is to suit lubrication of the crown wheel and pinion. As The trutrac is a helical gear designed to lock, unlike the stock diff, it does not require the extra slipperiness of an FM oil.

Having said that, why waste your money on a LSD modified oil?