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Drivetrain Gearbox, Diffs & Driveshafts etc

gearbox and diff oil change!

Old 19 August 2016, 10:00 AM
  #61  
Ver4STI
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I ordered 5 litres of Gulf competition 10W-40 and 5 litres of Gulf Competition 75W-90

changed the engine oil, gearbox oil, and the Diff oil.

Can honestly say its brilliant stuff, i can genuinely tell the difference in the gearshifts.

for the price and knowing the quality of the oil is top notch, its a worth while investment and an area i think people should be spending money on and not going for cheap alternatives.. just the same as tires.. regardless how well built your car is and what expensive parts you have OIL is very important. !!! so why not go for top of the range oil if you genuinely care about your car.

thanks OILMAN for your advice
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Old 19 August 2016, 12:39 PM
  #62  
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Hi

Brilliant, glad it's working out well for you. It is a top end oil and a lot of people that have used other top end oils went to the Gulf to save some money, then stuck with it when the prices went up for a while (they are back to where they were now).

Cheers

Tim
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Old 28 August 2016, 07:35 AM
  #63  
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Originally Posted by oilman View Post
Hi

Brilliant, glad it's working out well for you. It is a top end oil and a lot of people that have used other top end oils went to the Gulf to save some money, then stuck with it when the prices went up for a while (they are back to where they were now).

Cheers

Tim
So, Tim are you saying Gulf the one to go for or Redline is better or?

Sorry if the answer is clear to others 😉

Thanks...
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Old 28 August 2016, 12:12 PM
  #64  
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They are both top end oils and I'd have no preference. Red Line is better proven, but the Gulf oils are better value and still very good.

Cheers

Tim
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Old 28 August 2016, 01:29 PM
  #65  
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Hi I use motul300 gearoil but if I am on track and I have made a couple of laps I have the feeling it's getting harder to shift.
How can this be the gearoil is not that old.
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Old 30 August 2016, 08:43 AM
  #66  
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Hi

I have no idea, it's top end gear oil and well proven in Imprezas. Is your car standard or modified? Is the box modified?

Cheers

Tim
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Old 30 August 2016, 12:06 PM
  #67  
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Box isn't modified normaal dccd box but engine is forged 440hp 20%meth.
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Old 30 August 2016, 01:16 PM
  #68  
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Hi

Very odd, normally the Gear 300 is ideal for that sort of set up. Perhaps try one of the other 75w-90 GL5s next time, like Millers CRX NT, Red Line 75w-90 NS or Gulf Competition.

Cheers

Tim
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Old 30 August 2016, 02:35 PM
  #69  
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Yes I can do that.
What's the best time to replace the oil?
.
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Old 30 August 2016, 03:17 PM
  #70  
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Hi

It really depends on how much use the car is getting and then how much of that is on track, but I would think probably every year or two if it goes on track a lot.

Regards

Tim
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Old 30 August 2016, 04:08 PM
  #71  
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Okay thanks and if the oil gets to hot can this be a factor maybe.
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Old 30 August 2016, 04:26 PM
  #72  
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Hi

Yes, although I would be surprised if normal track use would wear the Gear 300 out quickly.

Cheers

Tim
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Old 31 August 2016, 03:44 PM
  #73  
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Thanks Tim, I will get on to order some now from your site...
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Old 02 September 2016, 09:10 AM
  #74  
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Tim, speaking to a friend of mine he mixed Redline Shockproof Light with his gear oil in his 2005 Impreza and said it transformed his box.

Could I mix (he did 50/50) the shockproof with the Gulf Competition oil? Safe?
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Old 02 September 2016, 09:25 AM
  #75  
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Hi

Yes, it's safe to mix them. I've heard that it can make a big difference, but others have said it's made no difference.

Cheers

Tim
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Old 02 September 2016, 11:16 AM
  #76  
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Thanks Tin...
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Old 14 September 2016, 02:06 PM
  #77  
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Wow, what a difference this Gulf oil and the shockproof has made...thanks Tim and guys at Opie for a great service
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Old 14 September 2016, 03:44 PM
  #78  
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Brilliant, glad it's working out for you.

Cheers

Tim
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Old 14 September 2016, 07:45 PM
  #79  
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I will have to send this link to my mate so he can try this with his.
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Old 14 September 2016, 10:42 PM
  #80  
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I tried a bottle of shockproof with 3.2 litres of syntrax, didnt do anything lol, not sure if 4 or 5 bottles alone of shockproof would be better than no mixing at all but at near 90 its expensive gamble.

syntrax doesnt seem to cure the crunches anymore :-(
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Old 15 September 2016, 08:59 AM
  #81  
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Hi

That is only a quarter of the oil in the box having the Shockproof molecules, so that is quite a dilution.

Cheers

Tim
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Old 16 September 2016, 12:40 AM
  #82  
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Yeah, i read any more caused harm rather than good.

suppose its a marmite moment, try it and see if it likes it

a quart bottle should of done something tho, it certainly coloured all the gear oil blue from that small bottle !
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Old 16 September 2016, 09:21 AM
  #83  
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Hi

No, a higher dose would not cause damage, it's not supposed to be mixed, but some people do. It's an oil not an additive, so really it should be in the box on it's own. I wouldn't expect one bottle in 4L to make any difference, like I wouldn't expect one litre of 10w-60 to make much difference to the running of an engine if it was added to 5w-30.

Cheers

Tim
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Old 02 November 2016, 11:15 AM
  #84  
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Hi Tim,

I have a 330bhp 2005 DCCD box based Impreza STi. For the gearbox oil and diff I'm thinking that 5L of the Motul 300 75w-90 gearbox oil is very suitable. What do you think?

I'm not sure which of the following I require for the gearbox and diff:

http://www.opieoils.co.uk/p-897-motu...-diff-oil.aspx

http://www.opieoils.co.uk/p-899-motu...-diff-oil.aspx

http://www.opieoils.co.uk/p-68953-mo...ferential.aspx

Regards
Jack

Last edited by SubieJack; 02 November 2016 at 11:17 AM.
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Old 02 November 2016, 11:21 AM
  #85  
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Hi Jack

With the DCCD, you want the Gear 300 for the gearbox and then the Gear 300LS for the diff.

Cheers

Tim
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Old 03 December 2016, 09:03 AM
  #86  
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Hi, my Name is Max,

I'm from Germany and last week I bought an stock WRX STI WR1 with already 90k miles on it.
Since I don't know how long the gearbox and rear diff have not been serviced I'd like to change the oil in both of them.
Since my car is a WR1 it has according to the internet Suratrac front and rear LSD's and also DCCD.
The gearbox seems to be in a healthy condition, no grinding noises when driving the car harsh. The only problem I have is that with low temperature (below 10C) getting the first gear (and some times the second gear) in is for the first miles not so easy.
After doing 3 hours of research I found out that the Motul Gear 300 should be put in the gearbox and the rear diff, but maybe I'm wrong here.

So my question is which oil should I get for the gearbox and the rear diff?


Cheers

Max
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Old 05 December 2016, 09:32 AM
  #87  
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Hi Max

The gear 300 is ideal for the gearbox, but I would use a 90 LSD oil in the rear, like the Motul 90PA, Fuchs Gear 90LS or Castrol Axle Z.

http://www.opieoils.co.uk/c-679-sae-90-gear-oils.aspx

Cheers

Tim
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Old 05 December 2016, 09:39 AM
  #88  
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I've just filled up with gulf competition recently and it's been excellent. Changed the diff oil aswell and it was just literally 2 nuts on the diff. 1 nut to drain and 1 nut to fill up.
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Old 05 December 2016, 09:33 PM
  #89  
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Originally Posted by oilman View Post
Hi Max

The gear 300 is ideal for the gearbox, but I would use a 90 LSD oil in the rear, like the Motul 90PA, Fuchs Gear 90LS or Castrol Axle Z.

http://www.opieoils.co.uk/c-679-sae-90-gear-oils.aspx

Cheers

Tim
Hi Tim,

first of all thanks for your answer. So although having a Suretrac rear diff you recommend a 90 LSD oil? I thought only diffs with clutches need special LSD oil

Greets

Max
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Old 06 December 2016, 09:16 AM
  #90  
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Hi Max

I thought the DCCD cars have clutch LSDs? Is the Suratrac one mechanical? I'm not familiar with Suratrac. To be honest, you are fine using LSD oils in open diffs anyway, I recommended the 90 LSD oil as a safe option either way.

Cheers

Tim
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