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Fairly daft oil question

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Jimbo:
I need to top up the oil in the rear diff on the Disco, and change the oil in both diffs on the 110..........is it the same stuff in both vehicles, and is it EP90 ?

The Haynes book of fibs for the Disco says to use 75W/90R in the diffs - is this EP90 ?

And finally, Haynes also says to use 75W/90R in the transfer box - is this correct ?

Ta,
Jim

Jimbo:
In fact, so daft a question that no one is prepared to answer it.......perhaps I'm being a bit dense about what oil is what - anyhow, off to the motor factors to embarrass meself now  :oops:

MuddyMachine:
Ep90 for both vehicles, not sure about the transfare box sorry.

Range Rover Blues:
LT230 T-Box will be EP90 and so are your axles.  The Gearbox is probably ATF.  The odd one out is the T-Box on RRC made by Borg-Warner, it uses ATF.

Now EP75/90 is a semi-synthetic Extreme Pressure oil that starts with an equivelent viscosity to a 75 oil when cold but keeps it's viscosity when hot so behaves like a 90 when hot.  Effectivley making it less thick than a 90 on cold starts, better for gearchanges and fuel economy.  It does NOT thicken up when hot however.

Now I read somehwhere recently that GL5 spec oil is no good for older cars, or as it was put "gearboxs with yellow metals in them", but Halfrauds sometimes stock GL4, sometimes GL5.  GL4 is cheaper anyway.

Jimbo:
Motor factors was shut !!, so called in at Halfrauds as I was near one.....

£10.99 for one litre !!!!!!!!!! - how much ???????

To do both diffs, and the T-box I need nearly 6 litres, that's just over £60 for some oil...........is this right, or are they trying to take my trousers down ?

Admittedly they didn't have any 5litre cans, it was all one litre bottles.

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