7 replies to this topic

[Robert]

What's a good oil to use in the gearbox and diff?

I was thinking 75-90 in the gearbox and 80-90 in the diff.

The gearbox and diff has a few Kms on them so I was thinking of putting some of that nulon treatment in with the oil, good idea?

[MrSober88]

Think you have it pretty spot on. Was told to use 75w90 in gearbox and 80w90 in the rear diff. When I did my first service on the car by other forum members back in the day.

 

I also use the nulon stuff, not sure how good it is or if its bad. But I have never had a problem, so I will continue to use it.

[Robbks]

Castrol multitrax in the box, plus a big tube of Nulon G70.
And Castrol EPX 80/90 for the rear diff

you can also do a flush on the gearbox with ATF
-drain old oil
-refill with ATF
-drive it around gently until it's warm
-shift up and down through all gears multiple times
-dump ATF
-flush through with a litlre of new oil (leave the bung out)
-refill with Multitrax and G70.

the ATF is much thinner and gets itself into the bearings and synchro's and extracts gunk.

I've also seen this procedure done on a hoist using diesel with good results

[Robert]

Thanks guys,

I was looking at redline oil, or would it be overkill for mine?

[Robbks]

redline is a waste of money.
And it's bad for synchro's, it gums them up and gets stuck in there and goes hard

[Robert]

Good to know!

Ah well I can easily get the castrol stuff

[Robbks]

Good but cheap oil, change frequently.
metal particles will destroy your box regardless of how expensive your oil is.

[U-Shell]

Nulon G70 works magic in the 5 speeds. Also using a full synthetic make an absolute world of difference compared to the cheaper stuff.