Thread: A New Sticky? Oil and Grease Specifications for Series III = Gearbox Oil

Lionel, that'd be the last oil I'd use.

EP90 would shift like **** and unless it used buffered sulphur would corrode the synchro's badly.


I'll leave it up to regular users on what to recommend.

Originally Posted by rick130

Lionel, that'd be the last oil I'd use.

EP90 would shift like **** and unless it used buffered sulphur would corrode the synchro's badly.

Hello Rick130,

I found an old thread with a posting from Diana which recommended Penrite EP 30 Mild. What oil do you use bearing in mind the bronze components? The description of this oil states that ...

Penrite Mild EP Gear Oil is an SAE 110 extreme pressure automotive gear oil meeting the requirements of API GL-4 for moderate to high load applications.

Mild EP Gear Oil is designed for use in all steel gear sets in vintage and classic cars and trucks, as well as rack and pinion steering systems of 1950's and 1960's vehicles. It is suitable for use in spiral bevel, worm and pre 1960 hypoid axles.

Mild EP may be used where SAE 90 grades were originally specified (especially if the gearbox or diff is slightly worn) or SAE 140 oils were originally specified and the equipment is in good condition.

Rated GL-4 this gear oil does not possess the additive package found in later GL-5 gear oils, so it will not attack metals such as bronze, brass and other yellow metal bearing metals (Penrite Mild EP Gear Oil).

Is there any other oil available that people use that looks after the bronze?

Kind regards
Lionel

Originally Posted by Lionelgee

Hello Rick130,

I found an old thread with a posting from Diana which recommended Penrite EP 30 Mild. What oil do you use bearing in mind the bronze components? The description of this oil states that ...

Penrite Mild EP Gear Oil is an SAE 110 extreme pressure automotive gear oil meeting the requirements of API GL-4 for moderate to high load applications.

Mild EP Gear Oil is designed for use in all steel gear sets in vintage and classic cars and trucks, as well as rack and pinion steering systems of 1950's and 1960's vehicles. It is suitable for use in spiral bevel, worm and pre 1960 hypoid axles.

Mild EP may be used where SAE 90 grades were originally specified (especially if the gearbox or diff is slightly worn) or SAE 140 oils were originally specified and the equipment is in good condition.

Rated GL-4 this gear oil does not possess the additive package found in later GL-5 gear oils, so it will not attack metals such as bronze, brass and other yellow metal bearing metals (Penrite Mild EP Gear Oil).

Is there any other oil available that people use that looks after the bronze?

Kind regards
Lionel

Nulon do a couple.

Type LandRover in here Penrite Pre-1970 - NetLube



But against that advice I use TransGear 75W90 GL4 Semi Synth in Gearbox & TC

And I Use Full Synth 75W85 GL5 Progear in my Diffs (both Eaton TrueTrac) & mixed with 50% Moreys in my swivels .
I use these modern slippery oils for less friction / gear drag in my Electric Series3 ..... probably makes no difference.

And I Use Full Synth 75W85 GL5 Progear in my Diffs (both Eaton TrueTrac) & mixed with 50% Moreys in my swivels .
I use these modern slippery oils for less friction / gear drag in my Electric Series3 ..... probably makes no difference.

It makes a measurable difference on interstate semis going full syn right through the drivetrain.

Lionel,
You must have missed the many threads on the forum about gear & diff oils, they haven't been made into a 'sticky' though.

I've been using an EP75W90 GL4 sourced from a local blender.
There have been a lot of discussions on the forum around GL4 vs GL5. Apparently some GL5's are OK others might cause issues with yellow metals. I spoke with the MD of the blending company I use and he told me that their GL5 would be OK for my application but then went & organised some GL4 to be made up.

EP90 was what was recommended originally but it's difficult to obtain. EP75W90, or EP80W90 is a bit thinner when cold so can make for easier gearchanges until the oil warms up.

I've used Hypoid EP90 in cars & motorcycle gearboxes many years ago (in the UK) without issue and if you could obtain it I'm sure it would be OK except for the occasional cold mornings making gear selection notchy for a few Kms.
The only vehicle that had a problem with it was the Lambretta scooter, the clutch runs in the gear oil and EP created clutch slip so you had to use an ST90.


Colin

For me, I like Castrol oils, so follow this selection advice:

Castrol Australia - NetLube

Mark

Originally Posted by MarkM

For me, I like Castrol oils

Any particular reason ?

Do they blend locally or Overseas ? I know a couple of the oil companies shared facilities in Australia a while back, same oil different packaging....Others import.

Castrol recommend slightly different grades for diffs & gearbox, the HP additives might not be needed in the gearbox but it was always the same spec oil used when the vehicles were produced.
I find the ‘big name’ brands are expensive hence I use an independent blender.

Colin