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Drivetrain Gearbox, Diffs & Driveshafts etc

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Old 18 April 2009, 11:00   #1
bigmac1531
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Default gearbox and diff oil change!

i thought i'd put this out here before i give it a go!!!!!!!!!!

i want to change the gearbox and diff oils on my uk turbo (98) but i don't really know what fluid is best to use. i just wondered if anyone could shed a bit of light on this for me.

i also take it that to change the oils is a very similar way in which to do the engine oil i.e sump and filler ( obviously making sure that i can actually get the filler off first!!!!)

any help would be really appreciated

thanks in advance
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Old 19 April 2009, 17:32   #2
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bttt anyone please!!!!!!!!!
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Old 19 April 2009, 19:34   #3
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Pm oilman on here, what he doesnt know about oil isnt worth knowing
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Old 19 April 2009, 20:42   #4
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i used castrol syntrax gear oil which is 75/90
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Old 19 April 2009, 22:21   #5
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castrol syntrax. halfords do it.
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Old 19 April 2009, 22:50   #6
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Syntrax works very well in Scoobys, but you can get better

75w-90 Gear oil

Silkolene Silktran Syn 5 is great stuff if the gearbox is in good condition, if not any wear can become more obvious when using it. Motul Gear 300 and Redline Lightweight Shockproof are good if the gearbox has been showing some wear.

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Old 20 April 2009, 19:01   #7
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Hi Tim,

400 bhp, 2002 STI, what would help keep the gearbox healthy, does a bit of trackwork, but usually about 6000 miles a year total. I hope to "bodge" an oil cooler onto it during the year also.

TIA.

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Old 21 April 2009, 09:35   #8
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Hi Dunx

Silkolene Syn 5 is a great choice if the gearbox is in good condition. Motul gear 300 is very similar, but it's better at covering up wear than the Syn 5. Amsoil also do a good one.

75w-90 Gear oil

Cheers

Tim
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Old 29 April 2009, 01:48   #9
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You have 3 Castrol Syntrax oils in the 75-90 section, which is best to use? In particular for my 99 Sti Ra Ltd, which has a Helical Front Diff (LSD I believe) and LSD in the rear diff as std. I have a post in another thread waiting for confirmation on this........... Anyone?
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Old 29 April 2009, 10:04   #10
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There is the Castrol Syntrax, Castrol SAF-XO and the Castrol TAF-X in that section. The one to go for is the Castrol Syntrax.

Cheers

Guy
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Old 10 May 2012, 22:23   #11
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I see this is an old thread but :

Will your Motul Motylgear 75W-90 Gearbox and differential lubricant Technosynthese - 1 Litre be as good as the 300? >Oilman<

Had intended to buy and collect at jap fest this sat but sadly cannot make it.. my friends will be there but wasnt sure if they could collect in my name ? :-/

Thanks Patch
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Old 11 May 2012, 10:41   #12
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Hi Patch

No, the Motylgear isn't as good as the Gear 300. The Motylgear is a decent oil, but the Gear 300 is a proper top end, ester based oil.

Unfortunately the Japfest pre-orders have ended as the van is being packed at the moment.

Cheers

Tim
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Old 28 May 2012, 22:35   #13
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Just changed the oil in my 2.5xt Foz.
It had been grinding going into 4th both ways for the last 30k.
Bought 2 quarts of redilne shockproof and topped up with 75/90, it now changes silky smooth even under hard acceleration.

Last edited by krazysteve; 28 May 2012 at 22:43.
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Old 29 May 2012, 10:59   #14
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Someone put cheap rubbish gear oil in my old WRX and I had difficulty in engaging first sometimes, and it wasn't smooth at all.
Switched to Castrol Syntrax and the difference was night and day.
I've read brilliant reviews of Motul Gear 300 and Redline on Nasioc and MLR.
Just goes to show it's not worth skimping on gearbox oil!
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Old 01 September 2013, 16:24   #15
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Default 2.5XTE 5 speed manual

Hi, can anyone please give me some advice about my 2006 Cat D Forester with genuine 7,000 miles. It had front damage (surprise!) which lifted and pushed back the engine 2 or 3 inches.
It jumps out of 5th gear with great force after being run at motorway speeds for 20 miles or so and does so continuously every few seconds until I stop and let it cool again.
I can run it around at 60mph without it happening at all.
Gears engage without problem and feel solid enough, but it's not possible to hold the gear in place when it goes.
The oil has never been changed and there are no signs of a leak
Thanks
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Old 11 September 2013, 16:08   #16
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If you have a dccd gearbox do you need to put a limited slip differential in the gear box?
Like this
http://www.opieoils.co.uk/p-68953-mo...ferential.aspx
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Old 11 September 2013, 16:30   #17
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Go for this one in the DCCD boxes

http://www.opieoils.co.uk/p-899-motu...ter-based.aspx

Cheers

Tim
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Old 11 September 2013, 16:35   #18
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Oke thanks,but there is a lsd in the gearbox why not lsd oil?
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Old 11 September 2013, 16:54   #19
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I don't think you'd have any issues with the LSD version of the Gear 300, but we have had no complaints about the normal version and it's a lot cheaper. Not all LSDs need LSD specific oils.

Cheers

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Old 11 September 2013, 17:21   #20
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Quote:
Originally Posted by makkink View Post
Oke thanks,but there is a lsd in the gearbox why not lsd oil?

the "correct" answer would be that it is not advisable use LSD oil in a synchro box as you will cause potential problems with both the change and can also cause additional wear on the synchro's

with a high quality synthetic gear oil it will cope with the DCCD loads no issue

feel free to email or call us for more specific advice if needs be
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Old 11 September 2013, 19:20   #21
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Oke thanks
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Old 11 September 2013, 19:20
 
 
 
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amsoil, box, castrol, change, changing, cooler, diff, diffs, gear, gearbox, impreza, oil, rear, sti, subaru, tafxo


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