Gearbox Oil Additive

[Dylaan]

So lately my gear box has been feeling less smooth than usual and I occasionally grind a gear when the clutch is all the way in. I just got near gearbox oil put in (a good one) and still I don't think it feels as good as I want it to. I hear about people putting an additive to reduce friction and give smoother changes. I know there are negatives to using engine oil additives but what about gearbox oil additives? Has anybody used something similar? What did you think of it?

Here is the item I'm talking about http://www.supercheapauto.com.au/online-store/products/Nulon-G70-Gearbox-Differential-Treatment-125g.aspx?pid=1397#Description

Dylan.

[Birds]

People tend to have mixed results using these. There are also theories about the teflon additive glazing the synchros...not something you want to do as your gearbox will end up worse to drive than before. I'd be trying Redline Shockproof before putting one of these in...but it sounds like your gearbox needs some TLC AKA rebuild.

[KiwiRS4T]

Synchros depend on friction to work. Just change gear a little more slowly or double declutch until you can afford to overhaul your box.

[ARTZ]

People tend to have mixed results using these. There are also theories about the teflon additive glazing the synchros...not something you want to do as your gearbox will end up worse to drive than before. I'd be trying Redline Shockproof before putting one of these in...but it sounds like your gearbox needs some TLC AKA rebuild.

pretty sure i read somewhere that the secret ingredient in redline shockproof is also teflon..

I put 2 tubes of that nulon shit in my box with castrol mineral oil, it didnt make any difference in everyday driving at all...however after a bit of spirited driving once the box is well warmed up it is really nice to shift..so yeah i dunno

[ARTZ]

Found it..

REDLINE SHOCKPROOF There are concerns about using REDLINE SHOCKPROOF type gear oils inside manual transmissions. While this is truly an excellent product, it has been found that the heavy Teflon-like particles are quickly centrifuged out of the oil and will build up inside the center diff housing and around the synchronizers and inside of the gearshafts. After several oil changes this build up may block oiling passages inside the gearshafts that lubricate the needle bearings and can reduce the overall effectiveness of the synchronizers, leading to poor shift quality. Also this oil is has too high of a viscosity for winter use. Therefore we do not suggest using SHOCKPROOF in the transmission unless the transmission is to be serviced often or a dog box.

most here using it seem to not have any worries though..probably cause most service regularly..I'm def gunna try it next time..

[Dylaan]

I don't think the nulon additive made a big difference, but it definitely made some difference. $12 well spent!

[turboedsloth]

Found it..

REDLINE SHOCKPROOF There are concerns about using REDLINE SHOCKPROOF type gear oils inside manual transmissions. While this is truly an excellent product, it has been found that the heavy Teflon-like particles are quickly centrifuged out of the oil and will build up inside the center diff housing and around the synchronizers and inside of the gearshafts. After several oil changes this build up may block oiling passages inside the gearshafts that lubricate the needle bearings and can reduce the overall effectiveness of the synchronizers, leading to poor shift quality. Also this oil is has too high of a viscosity for winter use. Therefore we do not suggest using SHOCKPROOF in the transmission unless the transmission is to be serviced often or a dog box.

most here using it seem to not have any worries though..probably cause most service regularly..I'm def gunna try it next time..

The winter part use, is that for Australia or the US? As our winters differ to the US's, which is why they may experience those problems

[ARTZ]

doesnt say anything about winter use