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IM-32-FK

Redline lightweight shockproof.

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I put this in a used pull type rb25det neo gearbox about 2000km ago. It takes like 15 min to fully warm up but then the gearbox feels amazing. 


But I recently heard that lightweight shockproof can damage the brass parts and synchros in your gearbox. Is there any truth to this? And I read on another topic here that r34 is meant to use super lightweight shockproof and not the standard one?

all in all, is lightweight shockproof just something you put temporarily in used gearboxes with wear and tear and should never be put into a rebuilt, new or good condition box? 

cheers

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It is a bandaid. Not to be used in a good box.

I have had it in my box which was pretty f**ked when I put it in, for......um..... nearly 10 years, and it has done no damage that I can notice from using the box.

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23 minutes ago, GTSBoy said:

It is a bandaid. Not to be used in a good box.

I have had it in my box which was pretty f**ked when I put it in, for......um..... nearly 10 years, and it has done no damage that I can notice from using the box.

What is a f**ked box though? I have no crutching issues but sometimes it feels weird putting it into second gear when travelling slow. Like in all the other gears in pops in very good smoothly but with 2nd gear it sometimes feels like it’s hitting something going in. I had to buy a used box when I blew mine and I didn’t open up the gearbox to inspect inside so I just put lightweight shookprrof

Edited by IM-32-FK
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If it doesn't crunch, it's not f**ked.

My box would not select ANY gear from neutral with the engine running, with normal oil in it, when I first put the box in. (it felt fine with no engine when I bought it!, which is why I bought it). We dropped the fresh oil out and put the blue shit in and it started to work. Been like that ever since.

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4 minutes ago, GTSBoy said:

If it doesn't crunch, it's not f**ked.

My box would not select ANY gear from neutral with the engine running, with normal oil in it, when I first put the box in. (it felt fine with no engine when I bought it!, which is why I bought it). We dropped the fresh oil out and put the blue shit in and it started to work. Been like that ever since.

So do you recommend that I change it? It’s been a year and a bit and about 2k km since I put it in. 

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Basically it does wonders for a gearbox which crunches going into gear due to worn synchros. Ironically, it's no good for synchros themselves and even says on the container not to use it in gearboxes with synchros.

The 6 speed getrag in the gtr takes ATF not gear oil, but the r34 gtt box takes gear oil.

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Just now, GTSBoy said:

If you don't need it, don't use it. Normal Castrol or Nulon or Royal bumblebee or just about anything else.

Maybe my gearbox is f**ked and I don’t know. what if it is and change the oil and it suddenly starts crunching? Then I’m gonna have to put lightweight shockproof back in. That’s $300 plus labour right there lmao


What’s the best one? I heard redline MT90 with nulon easy shift additive. I WANT THE BEST ONE.

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Lets face it, the gearbox is at least 20 years old. It has wear and tear. Just leave the oil in there.

I used lw shockproof in my old box for a few years. Synchros didn't feel like they got any worse, eventually 3rd gear broke but that had nothing to do with the oil.

FYI, i bought a brand new rb25 gearbox and when the oil was cold it was a little notchy going into 2nd gear. Pretty normal for an rb25 box imo.

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1 hour ago, GTSBoy said:

I'm of the opinion that gearbox oil is gearbox oil.

I’m pretty sure coles or woolies sells no frills brand engine oil. Would you put that in your engine too lmao 😂 

16 minutes ago, admS15 said:

Lets face it, the gearbox is at least 20 years old. It has wear and tear. Just leave the oil in there.

I used lw shockproof in my old box for a few years. Synchros didn't feel like they got any worse, eventually 3rd gear broke but that had nothing to do with the oil.

FYI, i bought a brand new rb25 gearbox and when the oil was cold it was a little notchy going into 2nd gear. Pretty normal for an rb25 box imo.

cheers for the info man, I’ll keep it in there, might as well. Is anything happens a few years down the line I’ll just get it rebuilt. And it’s good to know that’s the standard behaviour of the second gear.

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50 minutes ago, IM-32-FK said:

I’m pretty sure coles or woolies sells no frills brand engine oil. Would you put that in your engine too lmao

Dude, it's not the 1970s any more. Even shit grade oil is 100x better than the best oil used to be 30 years ago.

Yes, I would put supermarket brand oil in my RB25 if I had to. It would work fine. I don't because I can afford to use the good Penrite stuff. I don't subscribe to the magic swan juice school of lubrication fanboi-sm that circulates in the Jap import world though.

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3 hours ago, GTSBoy said:

Dude, it's not the 1970s any more. Even shit grade oil is 100x better than the best oil used to be 30 years ago.

Yes, I would put supermarket brand oil in my RB25 if I had to. It would work fine. I don't because I can afford to use the good Penrite stuff. I don't subscribe to the magic swan juice school of lubrication fanboi-sm that circulates in the Jap import world though.

I was joking. Thanks for the help my man👍

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I have only ever used Redline Lightweight Shockproof in my four manual R33s with no issues. It makes the gearbox much smoother than any other gear oil that I have used previously.

Some of the claims that have been made about Redline Lightweight Shockproof include it being able to be used for 400,000 km without needing to be changed. On this basis when I was once doing an oil change after 40,000 km in a R33 it came out very clean so my son reused it in his Mazda 626. That was over 210,000 km ago and that gearbox is still going great with oil that is now over 250,000 km old.

This is my experience with Redline Lightweight Shockproof.

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Ok, enough of the bullshit. Listen to the advice given mate.

Please see my recent gearbox upgrade in the white 32 gtr within the build threads - have a gander. If you need shockproof or a shift additive the damage has already been done to the box and will only ever be a band-aid fix. The only way to fix it is to FIX IT.

Can you guess the synchro that has had a shift additive ?

IMG_20200620_153727_5.thumb.jpg.96d69ae0929213029712899340fd8aed.jpg

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1 hour ago, Victory said:

I have only ever used Redline Lightweight Shockproof in my four manual R33s with no issues. It makes the gearbox much smoother than any other gear oil that I have used previously.

Some of the claims that have been made about Redline Lightweight Shockproof include it being able to be used for 400,000 km without needing to be changed. On this basis when I was once doing an oil change after 40,000 km in a R33 it came out very clean so my son reused it in his Mazda 626. That was over 210,000 km ago and that gearbox is still going great with oil that is now over 250,000 km old.

This is my experience with Redline Lightweight Shockproof.

 

Well, I had Redline Lightweight Shockproof in my gearbox for around 30,000km. When I dumped it, it was a brownish green sort of colour, quite sludgy, and it stank. I certainly wouldn't try running it for 400,000km 🙄

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1 hour ago, BK said:

Ok, enough of the bullshit. Listen to the advice given mate.

Please see my recent gearbox upgrade in the white 32 gtr within the build threads - have a gander. If you need shockproof or a shift additive the damage has already been done to the box and will only ever be a band-aid fix. The only way to fix it is to FIX IT.

Can you guess the synchro that has had a shift additive ?

IMG_20200620_153727_5.thumb.jpg.96d69ae0929213029712899340fd8aed.jpg

yeah enough said. its 2021 mates the answer is right here. fix your transmission if it grinds, then run proper gl-4 and be done with it. redline fluid is total junk.

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There just seems to be some sort of misconception that shockproof oil or shift additives "fix" your gearbox.

Or make it handle more power.

They do not.

I also find this amusing from the 'mericans. His gist is - don't run shockproof, it's not recommended to do so, but use it anyway because it you'll destroy 3rd gear before destroying a synchro ?! So use shockproof anyway and wreck the rest of the box - Righto mate.

https://www.gtrusablog.com/2017/02/what-oil-should-i-use-in-my.html?m=1

If you're breaking boxes, maybe you need a stronger box ? 🤔

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I had MT-90 before but running MTL now.  I prefer MTL, seems to suit better with the warmer and more humid climate I am located.

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Sounds good 👍 How does it shift at higher rpm ?

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