Gearbox Oil Additive

[rinmak]

Hey guys,

Im thinking of putting some gearbox additive into my line, you know the stuff that claims to make shifts smoother, improve gearbox life etc.

Just wondering if anybody has any comments about this stuff, or is it as useless as a GT wing

[MANWHORE]

I have used the nulon g70 addtive, and I noticed that it made absolutely no difference at all. It did not make it better when warm or cold.

There are two schools of thought floating around sau

1. nulon g70 contains teflon, which lubricates better, making gear changes smoother, and diffs less noisy.

2. nulon g70 contains teflon, which is TOO slippery and makes the synchros slip.

I've thought long and hard about which one is in fact correct, but my own experiements with it have not yielded any positive or negative resutls. Perhaps someone like sydneykid can comment on it.

[rinmak]

A friend of mine put some of this stuff in his S13 and its known to pop out of gear at times (2nd gear inpaticular).

This only happens when theres a few g's on the car, such as during dorifto

Is that what you mean by synchors slipping?

[MSRB26]

I have used Nulon G70 in an old car of mine, improved the notchiness in my case and just made it feel better in general, i personally haven't heard any bad reports about the stuff.

[gts4diehard]

Hi , i used some in my GTS4 and it improved things a little- its not a miracle gearbox fixer, a bit smoother gear change when car is cooler. Dont know if it has helped those 7k gear changes, maybe I 've improved my technique a little too. My car does not jump out of gear, I think the silvia gearbox has problems that are not related to additives.

[RB30-POWER]

I added some of this to a gearbox that had worn the hard casing of the input shaft to try and cut the noise down a little.

I think it made a small improvment to the noise.

Otherwise i wouldn't say the shifting changed at all.

If you run a mix of gearbox oil and auto tranny fluid you can get a nice shifting box under most circumstances. Alot of people i know run various ratio's such as 60/40 70/30 etc of the two oils with great sucess.

I would probally run a similar setup, but i need to keep the noise minimised. So i need to keep it thick as possible.

[rinmak]

Thanks for the feedback guys.

Think I will add some to my box. The early morning changes are getting quite annoying

[RB30-POWER]

What oil do you have in the box?

Should be something like Castrol VMX80 or equivalent.

That oil is designed for boxes that have cold shifting problems. (i.e. Nissan boxes)

[rinmak]

AFAIK its some valvoline oil.

Its about 500kms fresh

What  oil do you have in the box?

Should be something like Castrol VMX80 or equivalent.

That oil is designed for boxes that have cold shifting problems. (i.e. Nissan boxes)

[ax53b70]

Guys dont stuff around go and spend $100 on some redline gearbox oil from an autobarn, its the best stuff for our gearboxes, will be a little sticky when cold but it will protect your gearbox EVERYTHING ELSE IS SHIT!