Thread: Oil for transfer case...

the castrol oil you have choses is the one to go for the Tcase. Dont put it in the auto..

I personally prefer the nulon brand but at this stage thats mainly for logistical reasons and in some cases price.

Originally Posted by Blknight.aus

the castrol oil you have choses is the one to go for the Tcase. Dont put it in the auto..

I personally prefer the nulon brand but at this stage thats mainly for logistical reasons and in some cases price.

That's what I wanted to hear. Thanks for that. FWIW I know where the auto oil goes . thanks again.

you posted here,,
http://www.aulro.com/afvb/discovery-...ump-lt230.html
but did you read the earlier posts on which oils?

Originally Posted by Pedro_The_Swift

you posted here,,
http://www.aulro.com/afvb/discovery-...ump-lt230.html
but did you read the earlier posts on which oils?

Hey Pedro, yeh I read that thread. In the first post it mentions the oil but the author didnt mention the manual transmission part and I wasn't sure if a) it was a different oil or b) that the one I found had a special use for manual transmissions. I was 90% sure that was the one that you guys use but I didn't want to take a gamble if someone on here would be able to tell me in Less than 20 minutes. Thanks everyone for the clarification, ive had a few probs with the d2 recently and I didn't want another one do decided its better to ask someone who knows.

FWIW I came across this comment in a NAS Tech Bulletin from 2005:

NOTE: Land Rover has announced increased cooperation with Castrol. Castrol product names will be recommended as required fluids and lubricants on Land Rover vehicles where applicable.

For the Disco 2 diffs and transfer case the recommended products were:

- Texaco Multi-gear 75W90R GL5
and
- Castrol Syntec Full synthetic 75W90R GL5

I'm fairly sure the syntrax 75W90R is either the same or very close to the listed Syntec oil, so it seems to be a factory approved choice.

I understand that the Texaco brand is probably now a Delo Synthetic Gear Lubricant (75W-90) with Castrol Syntec it's VI, but should be similar. Syntrax has a VI of 161, so it is 10% more stable than the Texaco product, which in itself is very stable.... (Anything above 110 is considered to be very stable).


BTW: A high viscosity index indicates small oil viscosity changes with temperature. A low viscosity index indicates high viscosity changes with temperature. Therefore, a fluid that has a high viscosity index can be expected to undergo very little change in viscosity with temperature extremes and is considered to have a stable viscosity.

Delo's smallest available quantity is in 20l drums, but should work out cheaper than $30 per litre. (Haven't priced it yet). From the Caltex site it indicates that it can be used in all diffs and the transfer case, so about 7.2l is required.

Originally Posted by bsperka

I understand that the Texaco brand is probably now a Delo Synthetic Gear Lubricant (75W-90) with Castrol Syntec it's VI, but should be similar. Syntrax has a VI of 161, so it is 10% more stable than the Texaco product, which in itself is very stable.... (Anything above 110 is considered to be very stable).


BTW: A high viscosity index indicates small oil viscosity changes with temperature. A low viscosity index indicates high viscosity changes with temperature. Therefore, a fluid that has a high viscosity index can be expected to undergo very little change in viscosity with temperature extremes and is considered to have a stable viscosity.

Delo's smallest available quantity is in 20l drums, but should work out cheaper than $30 per litre. (Haven't priced it yet). From the Caltex site it indicates that it can be used in all diffs and the transfer case, so about 7.2l is required.

A high VI isn't always indicative of a long life/high quality oil either.

There are several ways of blending an oil with a high VI, the most common and cheapest/easiest way is to use a thin/low viscosity base oil and load it with viscosity index improvers. (polymeric thickeners)

This gives you the requisite viscosity range (eg 75W-90) but most common VII's are poor at handling shear, and gears in a gearbox tend to shear oils rather badly......

You'll sometimes see semi-synthetic fluids with very high VI's (180 and above) and you could bet your bottom $ they are blended this way, as is any mineral oil with a very wide viscosity span.

Neither the Caltex or Castrol fluids mentioned exhibit this problem, they use a blend of esters and PAO's which have a naturally wide viscosity span, so you can use either with confidence.

I'm pretty sure US Syntec is nothing like the Syntrax blend too.
Australian Syntrax is the same as European Dynadrive Plus (Transmission/diff fluid for the heavy vehicle market)

Thanks Rick

After looking at the product sheets the syntec and syntrax do appear to be quite different.

Cheers
Paul