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Hey guy another thread about gear oil

Every post i read turned into everyone saying each other is wrong with what oil to put in.

So it doesn't go into gear when cold unless i fight it

And it rarely crunches gear.

So reading the post everyone says use the following:

-Vmx-80

-Syntrans (i can only find syntrax?)

-redline shockproof (blue??)

Can i get a definitive answer please?

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Redline shockproof is somewhat of a bandaid solution to a gearbox that has sufficiently unhealthy synchros that they pretty much don't work.  Not the best solution, but compared to a complete rebuild, sometimes the best one available.  I used it in my RB25DET box after the transplant when it would not select any gear at all with the engine running (with conventional oil).  Instantly better.  Has been in there for years now, even though it has a reputation for not being the best thing to run long term.

Other gearbox oils are just gearbox oils.  Some a bit better than others.  Some offer the same rescue service that shockproof offers.  If your box refuses to engage gears when cold, I suspect your first port of call would be to try the best conventional oil and see if it helps, then be prepared to try the smurfs' blood.

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3 hours ago, Jonnoo said:

Syntrax $30p/L
Vmx-80&vmx-m $38 p/4L

Is syntrax really worth the money extra

Seems a small investment. What do you think you have in your box now that is different from the cheaper oil? I think you'll find Redline Shockproof is not cheap either.

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It wasn't about cheeping out, it was more about noticeable differences between the 'common oils' before i went with the redline. :)

Anyway its all done, i used syntrans

easy job, hardest part was getting the filler plug off.

Drained i recon just over 1.5 ltrs
Filthy oil had a bit of sludge
No big chunks of metal on the magnet

Filled about 2.4-2.5 L
Hopefully shes all good! If not its redline time! :)57b931782409e_ImageUploadedBySAUCommunit

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The 2 bottles above is how much came out

I used those 2 plus half a third, but i also spilt some.
No idea where a liter would have disappeared to tho

Gear changes do feel smoother
No abnormal crunches (not that there ever was) but definitely smoother...
I wont know for sure until tomorrow morning.

I think the clutch is disengaging properly, it doesn't roll when on a flat surface, next job is to bleed the clutch, never know when it was last done.

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2 hours ago, Jonnoo said:

 


I used syntrans

 

I know. I recommended Syntrax or Motul Gear but never mind. Do you in fact have any clutch pedal free play?

Anyway you may be right about the box. An RB20 box won't stand too much caning.

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I know. I recommended Syntrax or Motul Gear but never mind. Do you in fact have any clutch pedal free play?

Anyway you may be right about the box. An RB20 box won't stand too much caning.

Unfortunately they only had 1L in stock! I did try for the syntrax though.

Not really free pay but if i rev the car the peddle goes soft i can feel it sort of go lower if my foots resting on it, if that makes sense?!?

Yeah behind the 25 i don't think itll have much left even if it was fine

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