2007 2.5 si manual gearbox oil

Mark R · Post by **Mark R** » Sun May 20, 2018 7:20 pm

Hi guys, appreciate some wisdom if possible.
Going to carry out a gearbox oil change on the above car, question is I believe GL4 (75w80) was the standard oil spec but some now say GL5, however have read a couple of reports about this stripping the brass components.

Any thoughts comments would be greatly received.

Thanks Mark.

alane29 · Post by **alane29** » Sun May 20, 2018 7:46 pm

i used Castrol Syntrans 75w made a big difference to the gear box ,there was only 600ml left in there should be about 1200mm and it was black and smelly

alane29 · Post by **alane29** » Sun May 20, 2018 7:47 pm

here is a link to the one i bought

https://www.ebay.co.uk/itm/Castrol-Synt ... 1438.l2649

Mark R · Post by **Mark R** » Sun May 20, 2018 7:58 pm

Thanks Alane29, have seen that one mentioned before.

Mark

patriot66 · Post by **patriot66** » Sun May 20, 2018 8:35 pm

I changed mine back in April 2017. I always use Castrol oils in my vehicles and so used Castrol Syntrans B75W (API GL-4, ZF TE-ML 11) in the gearbox and Syntrax Long Life 75W-90 (API GL-5, ZF TE-ML 05A,12B,17B,19C,21A, BMW Non LS Rear Axles) in the diff. The diff took almost exactly one litre and the gearbox slightly more. The car was on stands and level. The Zeds mileage at the time was only just over 65k but the colour and condition of what came out of both the box and diff was quite horrendous...not to mention the awful stink ! The diff is definitely much quieter and the gear changes much smoother. Well worth doing

Mark R · Post by **Mark R** » Sun May 20, 2018 9:14 pm

Thanks looks like Castrol have good results. :

Mark

mjennings23 · Post by **mjennings23** » Sun May 20, 2018 9:42 pm

You want a GL4 oil for the gearbox, but to confuse matters some oils do have accreditation for both GL4 and GL5 (such as the Millers 75w80 I used) so just be aware of that

Scooba_Steve · Post by **Scooba_Steve** » Sun May 20, 2018 9:43 pm

Have used Castrol and Red Line in mine, and been happy with both. As long as it's suitable then change it, that's more important than minor brand differences. 30k is the interval I aim for

Mark R · Post by **Mark R** » Mon May 21, 2018 8:01 am

Thanks for the input everyone.

Magicarcher · Post by **Magicarcher** » Mon May 21, 2018 12:16 pm

Thinking of changing mine, those who have changed it, do you fit new drain plugs? If you do, presumably a main dealer part.

andyf1140 · Post by **andyf1140** » Mon May 21, 2018 3:13 pm

I've just ordered the Castrol oils to do mine at the weekend.

mjennings23 · Post by **mjennings23** » Mon May 21, 2018 3:26 pm

Magicarcher wrote: ↑Mon May 21, 2018 12:16 pm Thinking of changing mine, those who have changed it, do you fit new drain plugs? If you do, presumably a main dealer part.

I did, for the sake of a few quid it seems pointless not to.

Mark R · Post by **Mark R** » Mon May 21, 2018 4:35 pm

Thanks all, ordered the Castrol Syntrans for a change at the weekend.
Will let you know the difference.
Mark.

Magicarcher · Post by **Magicarcher** » Tue May 29, 2018 12:17 pm

Fitted Syntrans B to my 3.0i at the weekend, what a difference. My knotchy gearchange is considerably smoother and I actually don't mind accelerating rapidly from a standing start now.

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