Hey all,

I already have 2 quarts of 75w-140 supersyn gear oil from wal-mart. Is the 140w ok to use in this car? It's only got 52,000 miles on it so i'd prefer to not use it if its going to wear the diff quicker. I'd love some input from you guys, appreciate it!

 

As you've probably found, the OE Shell Spirax Super TS90 is unobtainable from all the regular sources.

There's a useful thread in X308 section discussing options:

https://www.jaguarforums.com/forum/x...ax-ts90-54273/

The grade you've got appears satisfactory but I can't find absolute evidence for it having the equivalent longevity to Spirax.

Graham

 

The synthetic 75-140 is fine in the diff in place of 90W as long as you live in a place that doesn't get real cold, like Canada. At very low temps, this 140 stuff will be some real glue and lubricate poorly. If Charleston is your usual location, it's fine. Keep in mind that weight designators for gear oil and engine oil are not the same..... 90W gear oil is similar in viscosity to 30W engine oil. 75-140 is meant for heavy duty applications like trasiler towing. Its a little heavy for a light car, but it will work, just inefficiently. I would use 80W-90 if it was mine.

 

Why change it..........are you low or leaking? Not too many complaining about diff failure.

 

When I worked at a indy Jaguar shop I used the BG diff flush machine to change it, but found out I put way too much LSD additive in it and thought about it to much. I am aware that we don't have LSD diff's, so that was another reason why I figured i'd flush it again. I would change it once again to 75w-90, but I broke just about every muscle in my body to flush it. If I should, I will do it again and put 75-90 in it

 

Here in UK an independent oil supplier Smith and Allan ( www.smithandallan.com ) supplies Shell Thermally Stable TS 90 oil, but in a minimum quantity of 100litres for £112 plus tax! They describe it as follows:

Thermally Stable Super 90 is uniquely
developed by Shell and Dana Spicer to provide
optimum performance in rear axle systems
It has been specifically designed for automotive
rear axle systems requiring LSD performance,
combined with excellent friction and high
temperature properties.
Extensive field trials have been carried out on
this product resulting in sole approval for initial
and service fill in Jaguar models and a number
of other UK OEMs using these axles. It is the
exclusive Factory and Service Fill axle oil for
the following models:

Jaguar XJR, XJ, XK and XKR

As an alternative, they offer:

LS90 Limited Slip Gear Oil SAE Grade 90/85W-90
Limited slip differential fluid at £18 plus tax for 5 litres

Special EP Gear Oil for Limited Slip Differentials fitted to cars, trucks, buses, agricultural equipment and construction machinery The product can be used as a rationalization product whenever SAE 90 or MIL-L-2105 B gear oils are specified. To guarantee the perfect function of limited slip differentials, a complete oil change is recommended when changing to the product.

API GL-5 API GL-5 LS ZF TE-ML 05C/12C/16E FORD M2C104A & M2C-105A

A visit to their website will get you the full technical specs of both and they compare closely.It includes a statement for the S and A oil to say it is manufactured to Shell's spec.

Hope that lot helps in making available the relevant info for individuals to decide what grade to use.

 

Also in the UK, Opie Oils supply Shell Thermally Stable Super 90 in I x Litre packs at £13.00 plus P&P with no minimum order quantity.

Shell Thermally Stable Super 90 premium quality LSD performance axle oil

Here is the Shell Product Sheet for Thermally Stable Super 90:

Thermally Stable Super 90 TDS.pdf

This document quotes the Jaguar P/N JLM 20237.

Graham