Diff/Transfer Oils (I've read the good oil)

[Shakey]

I'm more confused than when I started reading the good oil. Diff and transfer oil are on my list to do in the TD5 and RAVE states 75W/90R (first question what does the R mean/is it important as most oils don't seem to have the R). But TGO seems to suggest other variants.

So would Penrite Trans Gear Semi Syn 75W/90 be OK or if not could somebody be kind enough to direct me to a post which shows me the error of my ways please?

[OffTrack]

I'm more confused than when I started reading the good oil. Diff and transfer oil are on my list to do in the TD5 and RAVE states 75W/90R (first question what does the R mean/is it important as most oils don't seem to have the R). But TGO seems to suggest other variants.

So would Penrite Trans Gear Semi Syn 75W/90 be OK or if not could somebody be kind enough to direct me to a post which shows me the error of my ways please?

The penrite is fine.

Cheers
Paul

[PhilipA]

Any GL5 75-90 or 80-90 should be OK. I think I have Nulon.
I had a read of my owner manual when I changed mine recently and AFAIR that is what it said.
I was more concerned with the GL5 bit, as the EP additive can eat bronze bushes so it seems there are none in an LT230.
I have put 85-140 in my rear axle as I had some at home and it is good for towing in hot conditions.
Regards Philip A

[kelvo]

I run Penrite Trans Gear 75W-90 in mine, good old Malz & their oil specials ;)

[Shakey]

Thanks for the info everybody. The Penrite is GL-5 and was in the Malz sale, so happy days!

[twr7cx]

Pick your favourite flavour of oil, then use their Lube Guide/Datateck website to find the correct oil for your vehicle from their range.

Personally I'm an Penrite < Penrite Australia - NetLube (http://www.datateck.com.au/Lube/PenriteAus/) > fan for both my vehicles. Although I use Castrol < Castrol Australia - NetLube (http://datateck.com.au/lube/castr_au/) > for a few items.
Note: it's often worth reading the footnotes as there is sometimes a better alternative mentioned in their.

A recent trick that I have learnt is that the SuperCheap Auto website has a function to advise you when a product goes on sale/special. Doing this you can prebuy before you need and a discounted price (provided your choice is within their stocked range).

[worane]

I have a drum of pennsoil 80/140 gear oil.Would this be ok in disco 2 diffs?

[twr7cx]

I have a drum of pennsoil 80/140 gear oil.Would this be ok in disco 2 diffs?

Seriously? Compare the numbers to the specifications (quoted in almost every post above), no, they are different oils.
Would you really risk long term damaging your diffs (and facing future rebuild costs) to skimp out on the right oil?

[PhilipA]

I don't really think that it would do any harm as long as it a GL5 oil with EP additives.
At 80W it starts off cold much the same as any other gear oil, but retains more viscosity as it gets hotter.
80-140 oils may reduce economy as they may cause more resistance in a diff , but provide greater protection for towing in hot conditions and that is why I have put it in my rear diff only.
i have put it in the rear diff of a RRC used for towing for several years with no ill effects.

Regards Philip A

[rick130]

What Philip said.

An 80W-140 is total overkill for a rover spiral bevel diff but won't hurt anything other than fuel economy, but an xW-140 is my viscosity of choice in a Salisbury as they run a bucket load hotter.