180k old Diff, Heavy or Lightweight ShockProof

[Roy]

Ok, so have been using Castrol oil in my diff and at the moment have Fuchs in my gearbox...but want to change both of them on Saturday for a day at Sandown on Sunday.

General consensus is use the Lightweight ShockProof in the gearbox, which is cool.

But what do i use in an original 180,000km gearbox, that sees up to 8 laps (20 mins) of track work?

Quote:

Lighweight Shockproof

A unique gear oil designed to lubricate racing transmissions and transaxles which see serious loads (not recommended for most syncro-type transmissions). It has excellent low-temperature flow which allows easier shifting when cold. May be used to obtain maximum power transfer in racing differentials which do not see high temperatures. Similar to a 75W140 gear oil, but with the lower internal friction of an SAE 30 motor oil.

Used in two-stroke and four-stroke motocross transmissions (often mixed in equal parts with SuperLight ShockProof™ Gear Oil).

Used in most road-racing differentials with moderate power and dogring racing transaxles.

And for Heavy Shockproof...

A unique lubricant containing a suspension of solid microscopic particles as an extreme pressure agent--unique solid dispersion which cushions gear teeth to help prevent tooth breakage and allows the use of lower viscosities. Recommended for heavily-loaded racing differentials and transmissions, Off Road racing and problem gearboxes. The viscosity characteristics allow the lubricant to resist throwoff and provide a film thickness similar to a 75W250 grade, while providing the same low fluid friction as an SAE 75W90.

Now my car/diff is a long way from heavily loaded racing differential, but the Lightweight stuff says it doesnt like high temps, and im guessing the diff gets pretty hot...i dunno, i got no idea.

Can someone in a similar position just tell me what they are using:)

...and one last thing, anyone tried the Redline water wetter?

[Guest two.06l]

Ok, so have been using Castrol oil in my diff and at the moment have Fuchs in my gearbox...but want to change both of them on Saturday for a day at Sandown on Sunday.

General consensus is use the Lightweight ShockProof in the gearbox, which is cool.

But what do i use in an original 180,000km gearbox, that sees up to 8 laps (20 mins) of track work?

Quote:

Lighweight Shockproof

A unique gear oil designed to lubricate racing transmissions and transaxles which see serious loads (not recommended for most syncro-type transmissions). It has excellent low-temperature flow which allows easier shifting when cold. May be used to obtain maximum power transfer in racing differentials which do not see high temperatures. Similar to a 75W140 gear oil, but with the lower internal friction of an SAE 30 motor oil.

Used in two-stroke and four-stroke motocross transmissions (often mixed in equal parts with SuperLight ShockProof™ Gear Oil).  

Used in most road-racing differentials with moderate power and dogring racing transaxles.  

And for Heavy Shockproof...

A unique lubricant containing a suspension of solid microscopic particles as an extreme pressure agent--unique solid dispersion which cushions gear teeth to help prevent tooth breakage and allows the use of lower viscosities. Recommended for heavily-loaded racing differentials and transmissions, Off Road racing and problem gearboxes. The viscosity characteristics allow the lubricant to resist throwoff and provide a film thickness similar to a 75W250 grade, while providing the same low fluid friction as an SAE 75W90.

Now my car/diff is a long way from heavily loaded racing differential, but the Lightweight stuff says it doesnt like high temps, and im guessing the diff gets pretty hot...i dunno, i got no idea.

Can someone in a similar position  just tell me what they are using:)

Roy only ran lightweight shockproof in our GTR once and after 5 laps of eastern creek BANG there goes third.... NOT RECOMMENDED FOR MOST SYNCHRO TYPE TRANSMISSIONS. I wont use it again. Also the heavyweight locks the rear diff when cold so you get the vibration when cornering like a mech 2-way(only when cold)

[Roy]

Yeh that most synchro boxes statement concerned me...but so many people rave about the stuff? As for vibration when cold, i can live with that as long as it does its thing when hot at the track.

So what gearbox oil then, Heavy shockproof or just go back to the Castrol / Fuchs that i have used in the past?

[Guest two.06l]

Yeh that most synchro boxes statement concerned me...but so many people rave about the stuff? As for vibration when cold, i can live with that as long as it does its thing when hot at the track.

So what gearbox oil then, Heavy shockproof or just go back to the Castrol / Fuchs that i have used in the past?

you know the ol' saying..."when your onto a good thing, stick to it"

[Roy]

But ppl have told me there is better:)

I may just stick with what i know, at least that way i can blame the age of the g'box and diff if something goes wrong. not the change in oil:)

[Roy]

Ok , well forget ths idea of running the Redline ShockProof oils. It could be very good stuff, but I haven’t been able to confirm that it does the job during repeated 20min squirts around a track.

So ended up going for:

- Castrol SAF-XA, 80w-140 for the differential

http://www.castrol.com/liveassets/bp_inter...XA_B1769_04.doc

- Castrol Syntrax 75W/90 for the gearbox

http://www.castrol.com/liveassets/bp_inter...90_B1278983.pdf

Will see how it goes over the next few weeks.

[Ronin 09]

Mate I've got the Redline blue stuff in the gearbox and diff...

http://www.redlineoil.com.au/oil-finder.asp

[someonestolecc]

I put shockproof heavy in my gearbox.

It lost 3rd about 1000km after (sedate street driving) and 4th about 1100km later.

I drove it around for a few days 1st>2nd>5th.. once day 3rd and 4th came back as if nothing had ever happened, I shifted into 3rd and it got stuck.

That was 3-4weeks ago and the thing is still stuck in 3rd

I can't say it was the shockproof because I'm sure the box was thrashed like a .2c hooker, it could also be my clutch (highly suspect)... but when I get it all fixed I'll be putting the normal redline gearbox oil into it (vmx or something).

I'll put the heavy in my mech diff I think that's what most people do.

[Roy]

Why do they warn about synchro gearboxes then:(

Anyway, ill run the Castrol stuff and see how it goes...im sure it will be fine:)

[Ronin 09]

Where did u get the info from your first post, Roy? I didn't find it on the .com.au website for Redline... and they recommended Lightweight Shockproof for the gearbox on my thing

[Roy]

Where did u get the info from your first post, Roy?

http://www.redlineoil.com/products_gearlub...ID=20&prodID=61

http://www.redlineoil.com/products_gearlub...=61&subcatID=20

http://www.redlineoil.com/products_gearlub...=61&subcatID=20

If you have been using it and there havent been any problems, then i doubt there is cause for alarm. But its a bit of a i havent used it, and the people that have posted about it havent used it on the track. I think Duncan used it in his R33 GTST, but im not sure:confused:

[Ronin 09]

Admitedly last time I went to sandown I had a bit of a clunk selecting 5th down the front straight... will just be gentle and double clutch it

BUT, I'm not out there to set the quickest lap time ever... I don't flat shift and generally double clutch it to save the gearbox... plus what does it save me? Maybe 2 secs around the whole track - i can live with 2 secs slower lap, I can't live without a gearbox!

PS will buzz u in the morning

[Roy]

Well huge thumbsup for the Castrol SAF-XA, 80w-140 (differential) and Castrol Syntrax 75W/90 for the gearbox:)

Only did about 100kms on the fluid before going to Sandown today...the diff flet great and the g'box slotted thru the gears much better...on the way home tonight with yet more kms on it the lash and harmonic from the g/box diff is all but gone...drives a lot better...so would recommend the Syntrac highly. AT $32 per Litre im glad it works well otherwise i would have felt dudded:)

Will see how it goes over the next 10,000kms behing a 180,000km old RB20 gearbox and diff punching out 235rwkwsm at the drags and club sprints ...fingers crossed it proves pretty durable with a bit of TLC:)

[someonestolecc]

Thanks for the info Roy I've mental noted that and maybe when I run out of the redline oils I bought a bunch of when I got my cef I might try it.

I thought you were selling your car? Good on ya for staying with us a while longer

[Roy]

Yeh sure the car is for sale, whether it sells or not is a different matter. It doesnt have a leather interior, it doesn have a big stereo, isnt mega low, and doesnt have chrome wheels and doesnt have a bodykit...so not many interested parties:(

If it doesnt sell then it can have a few months R & R in a garage:)

[someonestolecc]

No worries - if it needs someone to run her I'll run her for you

My cef is still stuck in 3rd so wouldn't mind a nice sounding car you can actually turn on and walk away from without having to sit in it and keep the clutch pedal in

or... will you be re-upholstering it and putting full sick chromies on her ? :barf:

[Roy]

G'box still playing up:( Stick with it, when its up and running you wontbe able to wipe the smile from your face...things are always sweeter after the bitter:thumbsup:

[Greg]

Roy - still happy with the oil? Looking at changing diff oil this weekend. Thanks

[Roy]

Just another update. Fresh Castrol Syntrax 75W/90 went in before the Dutton Rally, and the gearbox is still alive. So i will gladly vouch for the Castrol gearbox oil...its helping my poor old gearbox last behind a 230-250rwkw RB20 running semi slicks