Gearbox and limited slip diff oil
I've just been hit by a dose of paranoia.
My RB320 is in for service monday and is having a complete fluids change. Rather than risk any old cheap oil being put in my pride and joy i bought my own oils from Opie. I used there drop down list and believe i bought the correct oil for my gearbox and diffs. I bought 6 Litres of Millers CRX 75w90 NT. The reason for my paranoia is i looked on the millers website for info on this oil (wondered what nano was) and used their drop down list, they recommended EP 75w80 GL5. I'm hoping i have just bought a better oil than what millers site recommend? Have i bought the right oil for my car?? I don't want to appear rude in anyway but, no guess work please lads. This is my baby so i need to know facts :thumb: |
I just ordered new oil from AS performance and the CRX 75w90 is what Alyn recommended for the gearbox and CRX 75w80 for the dif
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I used 75w90 motul in my06 hawk for gearbox - no probs
For rear diff- must be LSD spec oil ( limited slip Diff ) Subaru recommends 5w/30 engine oil ( ok for normal drive ) , and a lot of scooby owners use 15w50 or similar ( better with high temp ) hope this will help in some way Good luck |
Cheers lads. This is what the Millers site say regarding CRX 75w90 NT.
Application Designed for the lubrication of competition gearboxes. Manual transmissions, synchromesh, non-synchromesh, sequential gearboxes, transfer gearboxes and hypoid differentials without limited slip which require API GL4 or GL5 performance. Recommended for modern transmissions where fully synthetic oil is specified, especially for high performance road and track day applications. Hewland, Xtrac, Glebe Transmissions, ZF, Tran X, Elite Transmissions. Note: Does not contain friction modifiers. For plate type Limited Slip differentials use CRX LS 75w90 NT |
I've just been on the opie site again. For my car (RB320) the upgrade recommended oil for the gearbox, front and rear diff is CRX 75w90 nt which is what i bought. But if you look at oils for limited slip diffs (non car specific) they say CRX 75w 90 LS (weights vary). All very confusing. Maybe my car has a different type of limited slip diff to the type that would use the LS oils ?
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I have used the regular crx 75w 90nt in both gearbox and rear diff (dccd) without issue. I've also used the ls for the rear diff and didn't notice any difference.
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This is interesting as heard that if you do not use correct LS oil in the rear can cause wheel locking at low speeds, I currently have the CRX 75/90 in both box and rear diff, wonder if this may be my issue with the locking when carrying out tight turns at low speed when the oil is hot.
How can I clearly identify what rear diff I have? |
I do believe the LS is the correct oil for the DCCD equipped cars rear diff. That's why I swapped.
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Originally Posted by Einstein RA
(Post 11181949)
I do believe the LS is the correct oil for the DCCD equipped cars rear diff. That's why I swapped.
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Looked in my hand book and it says use an API GL5 spec oil in the rear diff. Both the CRX75w90 NT and CRX 75w90 LS are API GL5 spec according to the Specifications and Manufacturer Approvals data on opie oils site. So from that i would assume both oils are suitable for the rear diff in my car.
I would love to know exactly what diff i have and what the difference is in these oils regarding suitability for types of LS diff. |
Millers CRX 75w-90 is part of the Millers Motorsport range and is a competition full synthetic transmission oil. A blend of full synthetic base oils incorporating new “Nano Technology” additive chemistry to significantly reduce internal frictional and power losses. Use as received for the lubrication of competition gearboxes, and axles, which require API GL4 or GL5 performance. Suitable for use in synchromesh and sequential gearboxes. Ideal for combined synchromesh gearbox and limited slip differentials. Recommended for modern transmissions where full synthetic oil is specified, especially for high performance road and track day applications. Competition full synthetic transmission oil with friction modifiers for limited slip differentials. Millers Oils CRX LS Synth 75w-90 incorporates “Nano Technology” additive chemistry to significantly reduce internal frictional and power losses, whilst providing additional shock protection to dog rings and gears. Use as received for the lubrication of competition ‘dog’ gearboxes and axles which require limited slip high performance oils. Specially formulated for sequential gearboxes. Not suitable for synchromesh or overdrive boxes. Info taken from opie. |
Originally Posted by Inviroman
(Post 11181962)
What about none DCCD cars? What type of rear diff?
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So the CRX is fine in the rear diff? From some reading found that only Subaru rear diff oil should be used or motol oil?
Wonder if this is the cause of the rear locking up under tight turns at low speed and feeling tight when hot?? |
I ran CRX 75w90 NT in the gearbox of my old Spec-D without any issues Chopperman. For the rear diff it was a bit noisy with Millers CRX LS 75w-90 NT so I switched it to Motul 90 PA and it was fine.
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Originally Posted by DT-SPD
(Post 11182030)
I ran CRX 75w90 NT in the gearbox of my old Spec-D without any issues Chopperman. For the rear diff it was a bit noisy with Millers CRX LS 75w-90 NT so I switched it to Motul 90 PA and it was fine.
Im not going to use the LS as with reading up tonight and talking to you gents i think the NT i have already bought is ok and its recommended by opie . Should i find after its noisy or any other negative issues i will drain it out and try something else. I think we have at least established CRX 75w 90 NT is not the incorrect oil for the rear diff. Whether its the best i think is still open for debate. :thumb: Thanks for your help tonight guys. So far its been a very interesting read :thumb: I'm still rather hoping someone in the know can tell me exactly what type of LS diff we/i have and any more info on oils or experiences is gratefully received. :D |
Yeah I'm good thanks, not been on here a lot since selling the spec D this time last year. Got a 9 week old baby boy now that takes all my time but still fancy another Subaru sometime.
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Originally Posted by DT-SPD
(Post 11182236)
Yeah I'm good thanks, not been on here a lot since selling the spec D this time last year. Got a 9 week old baby boy now that takes all my time but still fancy another Subaru sometime.
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we generally supply/recomend a pukka L:S oil for the R180 rear diffs (new-age STi, Type-R, STi RA, etc.) and wouldn't normally suggest using straight gear oil.....................
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Not sure about the box oil, but I just done my rear diff last week. I used motul 90pa. No probs at all. 2004 STi.
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Originally Posted by AS Performance
(Post 11182631)
we generally supply/recomend a pukka L:S oil for the R180 rear diffs (new-age STi, Type-R, STi RA, etc.) and wouldn't normally suggest using straight gear oil.....................
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sorry should have clarified that CRX75w90 NT is perfect for the box...............for road use
for the diff then generally the likes of CRX80w90LS or CRX75w140NT LS for more arduous use also use/stock Motul 90PA and Gear300LS far easier and better IMO to get "real world" advice and product from someone that not only stock the correct product you require but can also back it up with any information or recomends and at the right price too...........:thumb: |
Originally Posted by AS Performance
(Post 11182729)
sorry should have clarified that CRX75w90 NT is perfect for the box...............for road use
for the diff then generally the likes of CRX80w90LS or CRX75w140NT LS for more arduous use also use/stock Motul 90PA and Gear300LS far easier and better IMO to get "real world" advice and product from someone that not only stock the correct product you require but can also back it up with any information or recomends and at the right price too...........:thumb: |
Do the rear diff oil yourself mate. It's really easy. You don't even need to jack the car up. :).
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Originally Posted by LDNSTi
(Post 11182792)
Do the rear diff oil yourself mate. It's really easy. You don't even need to jack the car up. :).
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Yep. Just wait till it starts running out of the filler hole and put the filler plug back in. :). The pump I used to put the oil in was by a company called laser tools . Product code 4385. Made it sooooo simple. :).
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Originally Posted by AS Performance
(Post 11182729)
sorry should have clarified that CRX75w90 NT is perfect for the box...............for road use
for the diff then generally the likes of CRX80w90LS or CRX75w140NT LS for more arduous use also use/stock Motul 90PA and Gear300LS far easier and better IMO to get "real world" advice and product from someone that not only stock the correct product you require but can also back it up with any information or recomends and at the right price too...........:thumb: Cheers http://www.opieoils.co.uk/p-60232-mi...ssion-oil.aspx Or http://www.opieoils.co.uk/p-60260-mi...ssion-oil.aspx Or http://www.opieoils.co.uk/p-60255-mi...ssion-oil.aspx |
Originally Posted by Inviroman
(Post 11181932)
This is interesting as heard that if you do not use correct LS oil in the rear can cause wheel locking at low speeds, I currently have the CRX 75/90 in both box and rear diff, wonder if this may be my issue with the locking when carrying out tight turns at low speed when the oil is hot.
How can I clearly identify what rear diff I have? |
Originally Posted by Inviroman
(Post 11181932)
This is interesting as heard that if you do not use correct LS oil in the rear can cause wheel locking at low speeds, I currently have the CRX 75/90 in both box and rear diff, wonder if this may be my issue with the locking when carrying out tight turns at low speed when the oil is hot.
How can I clearly identify what rear diff I have? |
the wrong oil certainly wont help and will potentially wear the plates, etc. far quicker.............
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Which one of the three posted will be best suited to allow me to order.
I have been told that it may be the centre diff may need to be replaced as uneven tires and dohnuts can cause this to fail (none done by me) dohnuts that is, had to replace the tyres as had uneven wear when a bought the car. |
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