Logos2012

hi all, ive been looking at diff oils and im hearing conflicting information, so was wondering if you could help. I have narrowed it down to these contenders, if there are more please let me know; Redline shockproof, Millers CRT, BG Ultra guard (from states me thinks), Amsol. These are the oils that seem to be mentioned the most. Thanx.

harvey

iTrader: (48)

What rear diff do you have.
You can go to Halfords or any motor factor and get 75W-90 transmission oil.
Something like Castrol, Motul or whatever.
Contact Alyn Stockton at ASPerformanced and he will have some on its way to you today. He will also ensure it is the right oil subject to the actual LSD on your vehicle.

cster

If you have a mechanical rear diff, you may find you need to be pretty careful with the spec. and make sure it conforms to the owners manual for that model.
I put a synthetic 75W/90 in mine and it was horrendous until I changed it to a 90 LS oil.

harvey

iTrader: (48)

Unless it is a plated diff then something like Millars CRX LS 75W-90BM.
This is specific LSD oil for viscuous or torque bias but not plated diffes.

dabow

iTrader: (19)

sorry to hi jack the thread like. i found putting the normal type diff oil in mine makes a wrine type sound.

whats best for a 4.4 p1 plated diff.
pm me please.

cster

I am curious - what is a plated diff?
My car is an 06STI with a mechanical rear diff.

dabow

iTrader: (19)

i know the plated ones are supposed to be alot stronger.
but theres nothing regards the right oil for them.

harvey

iTrader: (48)

The normal rear diff in a Subaru is a viscuos diff and unless your diff has been changed on the 06 STi I think that is a viscuous diff. Check out your handbook but if it is not clear I can check it on Monday.
Also available are torque bias diffs.
Competition diffs tend to be plated diffs and these have a series of plates a bit like clutch plates and they limit slip by locking up. The plate diff was fitted on some of the early type Rs or RAs and they lock more than the viscuous and when turning a very tight corner on full lock you can sometimes feel the inside wheel on the rear skip. The plated diff requires different oil to the viscuous or torque bias LSD.
I can give you that information on Monday.

Logos2012

wow!!!!!!!!!!!! **** knows what diff ive got, the cars got so many different bits on it. I was told when i got the car that the gearbox was an STI stage 1, and thats all matey knew and he didnt seem to know a lot else either. Someone said theres no such gearbox, so im still not certain. I will need to get numbers off the actual gearbox and not off the chassis plate me thinks. Also if the gearbox was changed doesnt that mean the rear diff has to be changed to match. and if so, that means that would be different to original car spec too. Damn nips! lol. Do the diffs all look the same or is there an obvious way of telling them apart?

dabow

iTrader: (19)

i know the p1 diff was supposed to be plated.
if youcould pm me the details to what diff oil a p1 diff takes, that would be great

dabow

iTrader: (19)

just checked opie pols site,

p1 takes 75/80 ?
but a turbo 2000 takes 75/90 ?

i would have throught the 75/90 would have been the better oil really.
mygear box had redline stuff in.

as i was told it was better stuff.
but the rear diff, i can not really remember what i put in.

cster

If you have a mechanical LSD, you will need a limited slip oil, regardless of what Opie recommend for a given model.

dabow

iTrader: (19)

i know this is not my thread, but its finding out what this p1 diff is.
im very sure there plated, and that there lsd

just need to find out the properoil for it.
mayquiet it down alittle then.

vince-sti02

iTrader: (2)

sory to highjack the thread but my car has a mechanical rear LSD I have used 75w 90 as recommended but I am getting increasing binding noise from the diff always off throttle going around a corner slowly.

any thoughts

dabow

iTrader: (19)

this is what im getting mate.
it cost me, as when i first got the diff. i throught it was that damaged, them spent £250 on another diff, for it to do it again.

its deff a p1 diff, 4.4 and told its plated.
just need to get the right oil.

cster

Yeah - try using a 90 LS oil!
ps It is dead easy to change and you don't even have to jack the car up.

harvey

iTrader: (48)

The P1 comes with a 4.44 viscuous diff as standard so unless someone has fitted a plated diff after the event you have a viscuous and need the oil referred to above.

For a plated diff you need a different oil. This would be something like Millars CRX 80W-90 LS. This is specifically for mechanical or plated LSDs. Do not confuse with the product above for viscuous and torque bias diffs.
I have here a similar product from GB Lubricants that workd very well in plated diffs but the label is so oil stained and tarnished I cannot be sure of the reference numbers.

All the Millars diff/transmission oils above are available from ASPerformance.

greendragonkungfu

lol, yeah!


i bought 5 ltrs from opie and did the g-box and diff, the diff is a git if uv got a 5ltr tub of oil. i rigged up an old baked bean can with some hose pipe taped to it. proper messy it was!!
use a 1ltr tub with a spout!!!!
i will next time

cster

I know what you mean - I put as much in as I could using the 1 ltr container with it's own tube and then used a syringe for the rest.
5 ltr tub! - now the whole idea of that is making me giggle.
Love the baked bean can idea though - gotta use whatever comes to hand eh.

Cannon Fodder

iTrader: (100)

I have a MY04 Spec C and since changing the rear diff oil (75w90 semi synthetic) I have had noises at low speed when on full lock and when reversing.

Also when driving I get a noise similar to metal plates 'clanging' against each other, this weekend I'm changing the oil in the rear diff to Motul LSD 90PA oil which I have been led to believe will eradicate the noise.

I know that the rear diffs can be quite noisy in the Spec C's but I think that the 75w90 oil I have in there presently is too thin.

dabow

iTrader: (19)

so the diff on the p1s are not plated then, when i got the diff from grade-a he said they was plated, and that was why there so much.

would it hurt if i put oil for the plated ones?
would the diff be protected more with:
Millars CRX 80W-90 LS

im just after quieting it down alittle, but protect it at the same time.

Logos2012

well **** it ! I went to halfords and got castrol syntrax 75w90 and stuck it in diff(doddle). Whine has now virtually gone. The rest of whine, which isnt much, is at the gearbox and ive just taken delivery of some heavy shockproof.

cster

That is what I have up front and it is great.
It is just my rear diff. that is a mechanical LSD that needs the LS oil.

dabow

iTrader: (19)

spoke to opie oils, mine should have either 75-80/75-85 gear oil.
where as the uk has universal 75-90 oils.

still want to find out why i was told these diffs are plated

Rikimaru

That oil is the correct spec for a plated diff so should be fine. It's what I use in my STi RA and have no unsavory noises from my diff when wheel is rolled back to open.

harvey

iTrader: (48)

If your P1 has the diffs originally fitted by Subaru then :

Please note the Redline Shock Proof HD (Heavy Duty) is specifically designed for straight cut gear sets

dabow

iTrader: (19)

as far as i know mate it is. theresjust so much rubbish around about these scoob diffs.
its hard to find the right advice mate

still, i have some casteral 75-80 that opie oils advised for the diff.
hopfully it quietens it down.

vince-sti02

iTrader: (2)

I have just ordered 90 ls for my diff from opie oils, I just hope it works as i am getting pi55ed off motul gear 300 is 30euro a litre here.
So deliver Tuesday will update when i change, i did buy 2 litres so i can eradicate the motul. looking through the hand book i can just make out specific requirement circled in pen to use lsd oil but cant make out the spec as its scribbled in Japanese over it

vince-sti02

iTrader: (2)

I received my delivery Tuesday "thanks Opie Oils" well
put the ls90 in today and Yipeeeeee!!!!
no more noise have done about 5 miles including as many round abouts as possible and parking in the local super market and no noise at all, I just hope all this time has no adverse affects to the diff.

I would just like to thank this thread and all contributors.

I have had this problem for 2 years now I have spoken to many in this time, not one specialist has said I had the wrong oil in, in fact they all said use 75 w 90
including the last garage to fully service the car,

LS90

Cannon Fodder

iTrader: (100)

I can also verify that changing the diff oil to a 90 grade LSD oil has eradicated all the groaning, clonking and other weird noises that were occuring since I had 75w90 oil in the diff.

The noises were really evident on tight low speed turns and when selecting reverse when the car had been driven for a while.

The wrong oil was only in the diff for around 800 miles so I hope (and pray) that there are no long lasting issues.