Gear Oil etc

[Dark61]

I'm looking to replace the oil in the diffs/gear box /trf box and swivel hubs for the 74 109. I'm confused as to whether one type will do all, or whether I need to get different types for the diffs/trf box etc. Can someone put me right please? I popped into REPCO and asked for EP90 GL4 but I got a lot of head scratching.
cheers,
D

[incisor]

hard to come by

i use gulf western sae90 these days from supercheap $99 last time i bought it a few weeks ago

prior i was using havoline 80/90

best stuff i ever found was morris lubricants sae90

but they moved to melbourne so i stopped buying it.

[Sly]

Find your local Roberts store and price up a 20 Ltr drum of Castrol epx 80 /90. That's a one stop shop for your gear oil needs and at $99 a drum much cheaper than buying little bottles.

[B.S.F.]

Castrol epx 80 /90 is GL-5, and therefore not suitable for Series gearboxes.
.W.

[C00P]

I use 75W/85 gear oil(Nulon synthetic) in the transmission, which is the closest I can get to the EP90 spec without going to a GL-5 or paying big bucks. I use a fully synthetic oil in the gearbox as I've found it gets quite hot when worked hard (eg pulling a camper trailer around Tassie) and I believe synthetic oils tolerate heat better. I've found that on a long climb with the trailer on behind I can't put my hand on the gearbox housing after a while.

Cheers

C00P

[whitehillbilly64]

Hi Dark,
I got this from Repco.
$12 per ltr.

https://www.penriteoil.com.au/products.php?id_categ=14&id_products=80

whitehillbilly

[Dark61]

Hi Dark,
I got this from Repco.
$12 per ltr.

https://www.penriteoil.com.au/products.php?id_categ=14&id_products=80

whitehillbilly


for everything Mate or just the gear and transfer box?
cheers,
D

[whitehillbilly64]

Just gear and transfer box.
That what needs the GL-4.
I put it in the overdrive also.

whitehillbilly

[Dark61]

OK - understood re the GL4. I'm, getting there slowly!
Thanks.
cheers,
D

[incisor]

Castrol epx 80 /90 is GL-5, and therefore not suitable for Series gearboxes.
.W.

Have anyone actually seen gl5 oil cause a problem and I not interested in heresay.... Has anyone here actually seen it cause an issue?

Because I have been using gl5 for a long time now and am yet to see an issue.... Touch wood...

[schuy1]

Been using castrol 80/90 in all the series for years and not had any probs. Oils always clean/ish at changes, ie no shiny bits! Admittedly they dont do much hiway work now.
Cheers Scott

[C00P]

Hi Dark,
I got this from Repco.
$12 per ltr.

https://www.penriteoil.com.au/products.php?id_categ=14&id_products=80

whitehillbilly

Nice. Couldn't find that when I was looking. Will give it a try when I've used up the other stuff.
Thanks

C00P

[JDNSW]

The problem with GL-5 is that the EP additives can cause corrosion of the yellow metal parts in the gearbox. Unfortunately, from my understanding, the issue is not as simple as GL-4 vs GL-5, as the problem is not the EP rating of the oil, but the actual additives used by the manufacturer. Unfortunately, what is actually used in the oil is not exactly headlined by the oil manufacturer, and may even change between batches. And corrosion or not of yellow metal is not part of the GL specification.

There is no guarantee that simply specifying GL-4 removes the problem, and no certainty that GL-5 means there is a problem.

I have used Castrol GL-5 products for years without issues - but then I have not had the gearbox apart either (no reason to!). Further, I suspect that corrosion issues will only exist when the oil in use contains significant amounts of water. This suggests that it would be a good idea to change the oil in the box fairly often (annual?) if you live in a humid climate especially if the vehicle has little use. Less of an issue if you live inland and use it regularly enough to get the box hot for at least half an hour every few months.

John

[123rover50]

I use this.
I think it was around $100.00 for 20 litres.

[gromit]

Have anyone actually seen gl5 oil cause a problem and I not interested in heresay.... Has anyone here actually seen it cause an issue?

Because I have been using gl5 for a long time now and am yet to see an issue.... Touch wood...

I haven't 'seen' problems but don't do enough Km's and have mostly vehicles with already very worn gearboxes.

There have been reported problems but the blender I buy my oil from told me their GL5 'should' be OK but then organised some GL4 to be blended for me.

Problem appears to be that the 'high pressure' additive in GL5 can attack yellow metals (synchro & any bushes) and cause synchro's to not work as well as with GL4.


Gears Lubrication , Oil API Specification Review - Engineers Edge (http://www.engineersedge.com/gears/gears_lubrication_general.htm)
https://www.linkedin.com/pulse/difference-between-gl-4-gl-5-gear-oils-manual-transmission-daniel-shi
Guidelines for Using Gear Oil in Specific Applications (http://www.machinerylubrication.com/Read/30366/gear-oil-applications)

The oil I get costs about $25 for 5 litres and is GL4 so I'll stick with that but understand that some people are finding difficulty sourcing GL4.


Colin

[Dark61]

I sent Penrite an enquiry as to what they recommended and got this back:


A GL-4 oil has a little less EP or extreme pressure additive in the formulation. We don't do a GL4 as such but I believe our Trans Gear 75W-90 should suit. GL4 oils may have been requested for, to be more compatible with copper alloys but our formulations are friendlier with copper alloys than what oils, back in the day, were.
For your gearbox Gear Oil 80W-90 (but Trans Gear 75W-90 is ok).

Transfer case> As for gearbox, both options, 2.5L

Front diff> ONLY ProGear 75W-85*, 1.7L
Front axle swivel pin housings, use ProGear 75W-85, 0.5 litre each.

Rear diff> ONLY ProGear 75W-85*

*Product code for 2.5L is PROG75850025 (rated GL-4+). Note that this is normally considered only for gearboxes, but is right for your model.


cheers,
D

[Loubrey]

Penrite's website is pretty comprehensive and if you drive a pre-1970 vehicle this is their specific recommendation...

Penrite Pre-1970 - NetLube (http://www.datateck.com.au/Lube/PenritePre1970/)

Cheers,

Lou

[gromit]

Penrite's website is pretty comprehensive and if you drive a pre-1970 vehicle this is their specific recommendation...



Big savings if you can find a local blender rather than buying a 'name' brand.
I just paid about $24 for 5litres of EP75W90 GL4


Colin