Which Oil for my Manual Gearbox GQ

[Bloodyaussie]

***** MODERATORS NOTE *****

I have copied this out of BA's Members ride thread because it is useful and will get lost there.

Thanks Matt, George and Craig. Good info.

Having gearbox trouble.

Not sure which way to go as it can be very expensive to rebuild a gearbox but I am having no luck with second hand of late????

I dont want to leave it too long as there is a brand new Ci clutch in there and I am worried it will turn to shit with oil getting on it.... hmmm

[nissannewby]

Yeah Roofy the last time I was this broke was when I was supporting my mum about 5 years ago... paid her rent for a year, killer !!!

We will work through it though.

Not sure which way to go as it can be very expensive to rebuild a gearbox but I am having no luck with second hand of late????

I dont want to leave it too long as there is a brand new Ci clutch in there and I am worried it will turn to shit with oil getting on it.... hmmm

Why do you need to rebuild the box?

If there is oil in there mate I would be wanting to repair it as soon as possible cos if the friction plate becomes oil impregnated then it will need to be replaced. Also are you keeping an eye on the oil levels so you know exactly where it's leaving from?

[Bloodyaussie]

This box bites.... mainly 2nd gear and it also drops out of third and its own.

Still working out the best options now as this is all new.... I took a punt thinking that the box had done half the km's mine had done so thought I would be on a good thing, I was wrong and right??

My old box has a noisy 5th plus can be hard changing gear mainly in 4wd and also a very noisy bearing (George knows which one) as the one in there now has no bearing noise.

In trying to save a dollar I end up spending more.... lesson in this folks!!!!

[nissannewby]

What oil are you using?

[Bloodyaussie]

I would have to go outside and its cold and wet.... the bolts in my neck might rust???

[nissannewby]

I would have to go outside and its cold and wet.... the bolts in my neck might rust???

Why is everything a question? If your worried about rust put some of the oil on them while your out seeing what it is lol. You need to make sure the oil is a gl-4 oil.

[Bloodyaussie]

I cannot be 100% sure as I have done a big clean up and cannot remember if I used something else or if I did use the bottle of Castrol VMX80

My socks are wet!!!

[mudnut]

So, gl-4 as opposed to gl-5 is still an issue, Matt? That could be the reason my other box failed because Nulon reckoned their gl-5 oil was the one for my RB30 gearbox, and I used it.

[nissannewby]

I cannot be 100% sure as I have done a big clean up and cannot remember if I used something else or if I did use the bottle of Castrol VMX80

My socks are wet!!!

Who goes outside in just socks no wonder why your cold.

[nissannewby]

So, gl-4 as opposed to gl-5 is still an issue, Matt? That could be the reason my other box failed because Nulon reckoned their gl-5 oil was the one for my RB30 gearbox, and I used it.

Gl-5 is ok but the synchros in the Nissan box behind the 4.2 ( petrol and diesel) and the 3.0 diesel (all the same box) much prefer the gl-4 oil. I cannot comment on the box behind the rb30 mate but if the manual specifies gl-4 then this is what I would be using.

I changed from a gl-5 to a gl-4 oil in my patrol and noticed the difference nearly straight away. My box had dramas down shifting to 4th from 5th and also 4th to 3rd once the gl-4 oil went in this has probably gotten 50% better. I don't think it will get better as the damage may have already been done prior to me purchasing the vehicle but alls I changed was the oil.