How To Change Your Gearbox Oil

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Fritz
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Re: How To Change Your Gearbox Oil

Post by Fritz » Sat Mar 17, 2018 11:09 am

Can you remember how recessed the washer is in a new item? Mine still look a little proud of the recess.

Also would you know if the diff plug is also considered single use?

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Re: How To Change Your Gearbox Oil

Post by marco_polo » Sat Mar 17, 2018 11:34 am

I can't remember tbh, not a lot.

Yes, the Diff plug is also considered disposable. I'd strongly recommend investing in a Dimple or similar magnetic diff plug.
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Fritz
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Re: How To Change Your Gearbox Oil

Post by Fritz » Sat Mar 17, 2018 2:35 pm

Well turns out I enquired about the wrong plug, correct one is £6 each so not that bad at all. Diff plug is £4. And to answer my own question, alloy plug cos alloy gearbox casing :lol:

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Re: How To Change Your Gearbox Oil

Post by Ciprianconcept » Tue Nov 27, 2018 2:31 pm

Sorry to revive this topic, guys, but it might be helpful for others also. I have an 120d 177cp FL, manual gearbox, and I am looking into changing the oil, though I don't have any problems with my shifting, except the 1st gear, which is an old problem. What oil do you recommend from your experience to put into the gearbox/ maybe diff oil also? I read that the fluid might affect your consumption/performance? I don't get this part. Thanks for helping and sorry for the noob questions.

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Re: How To Change Your Gearbox Oil

Post by TheRuss » Tue Nov 27, 2018 2:39 pm

Not sure what to suggest for your particular car, but if the oil you replace it with is thicker, then your fuel consumption would increase, as there's more "drag" on the gears. This would also affect performance, reducing power to the wheels, but not by enough for you to really notice with your butt dyno, unless you put tar in there.

Likewise, if the oil is too thin then it might not provide enough protection to the gears, so make sure you get the correct grade if you do change.
Gone!: '65 plate F21 M135i LCI fully loaded, plus Birds suspension (paired to adaptive dampers) and Quaife differential! :(

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Re: How To Change Your Gearbox Oil

Post by Ballist1x » Wed Dec 19, 2018 10:49 pm

Got my replacement plugs for the gearbox and diff from bmw for my 125i.

The diff has a rubber seal built in.

The other two for the gearbox don't have a crush washer or seal, is that right ?

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Re: How To Change Your Gearbox Oil

Post by marco_polo » Thu Dec 20, 2018 10:47 am

My M135i gearbox plugs didn't have any kind of seal/gasket/washer from the factory.
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Re: How To Change Your Gearbox Oil

Post by Ballist1x » Thu Dec 20, 2018 11:02 am

marco_polo wrote:
Thu Dec 20, 2018 10:47 am
My M135i gearbox plugs didn't have any kind of seal/gasket/washer from the factory.
So how did you make sure it sealed properly ? Teflon take or liquid gasket ?

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Re: How To Change Your Gearbox Oil

Post by marco_polo » Thu Dec 20, 2018 11:08 am

I just torqued them up, it's been fine, so far.
Silver F21 M135i - ManBox - HK - Adaptive + Eibach Pro's - BBS CH-R's - BMWP Drexler LSD - M4 LCA's

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Ballist1x
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Re: How To Change Your Gearbox Oil

Post by Ballist1x » Thu Dec 20, 2018 11:42 am

marco_polo wrote:
Thu Dec 20, 2018 11:08 am
I just torqued them up, it's been fine, so far.
Okay thanks !!

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