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gearbox and diff oil change!

Old 17 November 2014, 08:45 AM
  #31  
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Hi

You need a 75w-90 for the gearbox and diff.

http://www.opieoils.co.uk/c-673-75w-...ion-fluid.aspx

If you want to go for the best, the Millers CRX 75w-90 NT, Gulf Competition, Motul Gear 300, Red Line 75w-90NS and Millers TRX are ideal for the gearbox. The Castrol Universal/Universal Plus, Motul Motylgear and Fuchs Gear Syn are all decent alternatives. The Fuchs Syn 5, Millers CRX, Redline 75w-90 GL5, Motul Gear 300 and Gulf Competition are ideal for the diff. The Fuchs Sintopoid, Castrol Syntrax Longlife, Millers TRX, Motul Motylgear, Mobil SHC and Gulf Syngear are also good choices.

Cheers

Tim
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Old 17 November 2014, 09:39 AM
  #32  
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Millers CRX range or the Motul gear300 IMO

we also stock Redline Light/Heavy weight shockproof if your an animal or high risk
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Old 20 November 2014, 03:18 PM
  #33  
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Shockproof is supposed to be the best stuff from what I've heard - a number of friends with STIs that developed a crunch in a particular gear found it was cured after switching to Shockproof (although I suspect it's probably a little late!)

I use Gear 300 in my widetrack's gearbox
What about this for the diff?
http://www.opieoils.co.uk/p-888-motu...-pressure.aspx
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Old 20 November 2014, 03:59 PM
  #34  
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Hi

Lightweight Shockproof is really good stuff, definitely something to consider, but I'd say the Gear 300 is probably the best proven one that we sell for the STi.

The 90PA is ideal for the diff.

Cheers

Tim
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Old 22 December 2014, 11:27 PM
  #35  
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Hi oilman,

For a 6 speed box that has developed a very slight crunch shifting down from 5th to 4th iv hear that the best thing do use is mix red line shockproof and motul 300? can you tell me what ratio of them to use and wether to use the heavy or lightweight redline?
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Old 23 December 2014, 02:02 PM
  #36  
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Not sure why people are mixing them, not sure there is much to gain. I would just use either one or the other.

If you have a crunch then try the lightweight shock proof http://www.opieoils.co.uk/p-1022-red...il-75w-90.aspx You will need 5 bottles for a full change.

Cheers

Guy
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Old 14 January 2015, 10:48 AM
  #37  
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Hi oilman
Can you tell me the best oil to use for a p1 rear diff. please ?
Bearing in mind it is a Suretrac fitted to the p1 so a mechanical lsd.
I will be using lightweight shockproof in the box but is this the right grade for the rear diff?
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Old 14 January 2015, 03:25 PM
  #38  
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Are you planning to use the lightweight shock in the diff? If so it will be fine, it is happy on 75w-90, 80w-90 and SAE90 it just needs to have the lsd friction modifiers in it.

Cheers

Guy
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Old 14 January 2015, 03:38 PM
  #39  
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5 bottles of shockproof will do gearbox (6 speed) and diff?
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Old 14 January 2015, 04:07 PM
  #40  
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A bit shy I think, 5qrts is 4.73ltr and you will need 4.1ltr for the gearbox and 1ltr for the diff.

Cheers

Guy
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Old 15 March 2016, 10:22 PM
  #41  
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Thread resurrection! I've just broken my 3rd 752 box in my semi facelift, 97 UK turbo and will be getting a 754 box in there next week but would like to get some oil ordered up tomorrow, preferably from Opie. Would the Gulf Competition stuff be as good as/ better than Syntrax Long Life?
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Old 16 March 2016, 10:43 AM
  #42  
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Hi

Yes, the Gulf Competition is top end stuff, the Universal Plus is good, but not in the same league.

Cheers

Tim
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Old 16 March 2016, 11:53 AM
  #43  
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Would you recommend the Gulf Competition over the Syntrax Tim? I found the Syntrax quietened down my 3rd box, I don't know what was put in the previous one.
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Old 16 March 2016, 12:23 PM
  #44  
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Hi

A lot of people like the Syntrax Universal in Impreza boxes, but it is only a semi-synthetic. Being a semi, it does a good job of absorbing sound, so would make sense that the noise is reduced, but it will not offer the same level of protection as the Gulf Competition (and as the Gulf is ester based, it's pretty good at quietening things anyway).

Regards

Tim
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Old 16 March 2016, 12:48 PM
  #45  
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Thanls for the advice, Oilman, I've just ordered 6L of the Gulf stuff to Belfast so I can get the rear diff all slippery as well!
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Old 22 March 2016, 08:33 PM
  #46  
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Got the oil and it shall be in the box and on the car next week all being well Just to confirm, the 754 box needs 4.1L of oil then does it? I had precisely 4L of Syntrax in the box I just broke
1L exactly for the rear diff then?
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Old 23 March 2016, 10:48 AM
  #47  
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Hi

Yes, it's 4.1L for the 6 speed box and 0.8L for the diff.

Cheers

Tim
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Old 23 March 2016, 11:41 AM
  #48  
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Originally Posted by oilman View Post
Hi

Yes, it's 4.1L for the 6 speed box and 0.8L for the diff.

Cheers

Tim
I wish I had a 6 speed going in! It's just a 5 speed Tim
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Old 23 March 2016, 11:43 AM
  #49  
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Ah, 3.5L for the 5 speed.

Cheers

Tim
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Old 23 March 2016, 11:48 AM
  #50  
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God, I had 4L in the previous 752 box, was that too much perhaps? I'm very much looking forward to feeling this Gulf stuff working some magic!
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Old 23 March 2016, 12:20 PM
  #51  
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Hi

I don't know how much empty space there is in that box, if there is loads, an extra half a litre isn't an issue. If there it only something like 750ml of air in there, then an extra 500ml of oil could cause a problem by putting strain on components.

Cheers

Tim
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Old 23 March 2016, 02:58 PM
  #52  
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Reference the amount of oil for a 5 speed, depends how much is emptied out, on fitting my replacement box it was emptied fully, tilted, lifted etc , so was pretty empty, i needed to put 4 litres in to the get a reading on the dipstick to the top small hole.
3.5 litres only just put oil on the bottom of the dipstick

HTH
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Old 23 March 2016, 04:48 PM
  #53  
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Thanks for that
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Old 31 July 2016, 10:43 PM
  #54  
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Sorry to grave dig this thread again.

I have an 05 (blobeye) 5 speed that's showing signs of age/wear, what's the latest recommended oil for this? (other than Shockproof, it's so expensive).

Thanks.
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Old 01 August 2016, 10:38 AM
  #55  
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Hi

Shockproof are the only ones that have that kind of technology, but the Castrol Universal often helps worn boxes.

http://www.opieoils.co.uk/p-744-cast...universal.aspx

Cheers

Tim
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Old 01 August 2016, 11:18 AM
  #56  
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Originally Posted by oilman View Post
Hi

Shockproof are the only ones that have that kind of technology, but the Castrol Universal often helps worn boxes.

http://www.opieoils.co.uk/p-744-cast...universal.aspx

Cheers

Tim
Brilliant. Thanks for the reply.
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Old 01 August 2016, 09:31 PM
  #57  
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Originally Posted by oilman View Post
Hi

Shockproof are the only ones that have that kind of technology, but the Castrol Universal often helps worn boxes.

http://www.opieoils.co.uk/p-744-cast...universal.aspx

Cheers

Tim
I'd be interested to know what your opinion is of Molyslip Gearbox protector is?

http://www.ebay.co.uk/itm/MOLYSLIP-G...25.m3641.l6368
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Old 02 August 2016, 09:21 AM
  #58  
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I don't advise the use of oil additives as a lot of them are harmful, others are just a waste of money. The Molyslip is a bit different though. It's been around for years and there is moly in most oils, so it's not like you're adding something completely different to the oil. The issue is that there will be other chemicals in the Molyslip that are used to make the paste and you can't tell how they will react with the oil that is in the gearbox or how increasing the level of moly will affect the behaviour of the oil.

Cheers

Tim
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Old 02 August 2016, 09:19 PM
  #59  
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Originally Posted by oilman View Post
I don't advise the use of oil additives as a lot of them are harmful, others are just a waste of money. The Molyslip is a bit different though. It's been around for years and there is moly in most oils, so it's not like you're adding something completely different to the oil. The issue is that there will be other chemicals in the Molyslip that are used to make the paste and you can't tell how they will react with the oil that is in the gearbox or how increasing the level of moly will affect the behaviour of the oil.

Cheers

Tim
Thanks again. I'll not bother. I should really just bite the bullet and go for Redline Shockproof. How would it be affected by any residual oil in the gearbox? Since it's an ester based oil and whatever is currently in it almost certainly isn't.
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Old 03 August 2016, 09:18 AM
  #60  
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Hi

It will mix fine with the oil that is in there.

Cheers

Tim
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