[F87source]

Originally Posted by doughboy

If you want MSP/A it's all over ebay in the UK, up to you if you want to pay shipping though.

Personally I don't think it is worth it imo.

Originally Posted by doughboy

Looking at the Motul race gear LSD oil that's 33% more expensive in UK than genuine MSP/A.

Maybe worth it for funky blue colour though

Race oil is not meant for street use because it lacks oxidation resistance to enable it to last for long periods of time. Literally some race oils are meant for a couple of track days or maybe a few months of use (and that's probably pushing it) before being flushed.

[doughboy]

Originally Posted by F87source

Race oil is not meant for street use because it lacks oxidation resistance to enable it to last for long periods of time. Literally some race oils are meant for a couple of track days or maybe a few months of use (and that's probably pushing it) before being flushed.

Sorry not race, I meant this stuff:

MOTUL Gear Competition 75W140 LSD 1L 100% Synthetic Transmission Oil 105779

Other have discussed, but do you think it's not suitable for street use?

[F87source]

Originally Posted by doughboy

Sorry not race, I meant this stuff:

MOTUL Gear Competition 75W140 LSD 1L 100% Synthetic Transmission Oil 105779

Other have discussed, but do you think it's not suitable for street use?

No that should be ok for street use. It specifies manufacturer recommend OCI as well, so it isn't completely track only.

[kthor703]

Originally Posted by doughboy

Was it warm/hot when you drained it? if cold its quite thick and slower to drain.

It was warm, but not hot off a drive. Diff was about 30 mins after bringing the car up to full operating temp. Trans about 1 hour after.

[vrooooom]

Originally Posted by kthor703

It was warm, but not hot off a drive. Diff was about 30 mins after bringing the car up to full operating temp. Trans about 1 hour after.

Probably the same with mine coz I did the oil first then those 2. I guess I should drive it around again after the oil, set it back on the lifter again for the diff and tranny. That way it's nice and hot for a more complete drain. Just too lazy to bring it down, drive and reset it back on the lifter again.

[Track/S]

Drexler diff with 650km, first oil change

[vrooooom]

Should have open the fill plug first. Just saying.

Upgraded diff?

[F87source]

Originally Posted by Track/S

Drexler diff with 650km, first oil change

Nice!

That's really grey for 650km despite it being break in. You might have to flush a second time after 1200km or 2000km just to be safe.

How'd you code out the diff? And how do you like the feel vs. stock?

Originally Posted by vrooooom

Should have open the fill plug first. Just saying.

Yup that's true. It would allow for a laminar flow as well instead of the glugging.

[Track/S]

Originally Posted by vrooooom

Should have open the fill plug first. Just saying.

Upgraded diff?

Yes, of csr

Originally Posted by F87source

Nice!

That's really grey for 650km despite it being break in. You might have to flush a second time after 1200km or 2000km just to be safe.

How'd you code out the diff? And how do you like the feel vs. stock?

I will do another flush next weekend.

The coding was done for me by a friend, the feeling is impressive, one of the best mods.

[F87source]

Originally Posted by Track/S

Yes, of csr



I will do another flush next weekend.

The coding was done for me by a friend, the feeling is impressive, one of the best mods.

Nice!!

Keep us posted.

[Track/S]

Second change after 300km

[E90convert]

Curious why you’re changing it so much? Is that 300km on track?

[Track/S]

Originally Posted by E90convert

Curious why you’re changing it so much? Is that 300km on track?

Its a new lsd diff.

[E90convert]

Originally Posted by Track/S

New diff.

Yeah, I see that… I just curious what your hoping to accomplish. From my professional experience, 1 break in change is enough to flush any significant break-in wear metals and assembly contamination out of the system.

Does the CSR/Drexler require multiple changes?

[Track/S]

Originally Posted by E90convert

Yeah, I see that… I just curious what your hoping to accomplish. From my professional experience, 1 break in change is enough to flush any significant break-in wear metals and assembly contamination out of the system.

Does the CSR/Drexler require multiple changes?

Do you think after the first change everything is clean? I think not and since the oil costs me 18e I don't mind doing one more flush.

[E90convert]

Originally Posted by Track/S

Do you think after the first change everything is clean? I think not and since the oil costs me 18e I don't mind doing one more flush.

Directionally, the cleaner the oil, the longer your bearings will live and the slower the oil will oxidize in service. In durability testing I have conducted professionally, the oil is never really "clean" after it goes in the gearbox. Even after you break in the product, and change the oil. There seems to always be some minimum level of contamination that sticks around. Fortunately, the bearings and oil change intervals are typically designed for long life in whatever the manufacturer considers normal operation conditions (temp, loads, speeds, contamination levels) with specified statistical reliability.

[doughboy]

Looks OK visually, assume the oil was blue when it went in?

Have you sent it away for analysis?

And why the neck don't you take out the fill plug first to get a smooth drain?

[F87source]

Originally Posted by Track/S

Second change after 300km

It's alot better, there's actually some color in it now. It probably needs one more flush to be perfect. I'd probably do it after 1,000km for this one.

[F87source]

Originally Posted by E90convert

Directionally, the cleaner the oil, the longer your bearings will live and the slower the oil will oxidize in service. In durability testing I have conducted professionally, the oil is never really "clean" after it goes in the gearbox. Even after you break in the product, and change the oil. There seems to always be some minimum level of contamination that sticks around. Fortunately, the bearings and oil change intervals are typically designed for long life in whatever the manufacturer considers normal operation conditions (temp, loads, speeds, contamination levels) with specified statistical reliability.

Personally I don't trust BMWs fluid lifetime intervals. Bmw says coolant is life time, pentosin says it's more like 4-5 years. Bmw said mtf is lifetime, ZF who makes the gearbox says it's like 4 years.

[allinon72]

Always remove the fill plug first.

[Track/S]

Originally Posted by F87source

It's alot better, there's actually some color in it now. It probably needs one more flush to be perfect. I'd probably do it after 1,000km for this one.

Next in 2500km, I'm on way to the ring.

Originally Posted by doughboy

Looks OK visually, assume the oil was blue when it went in?

Have you sent it away for analysis?

And why the neck don't you take out the fill plug first to get a smooth drain?

Yes, motul gear competition.
I don't plan to analyze it.

[F87source]

Originally Posted by Track/S

Next in 2500km, I'm on way to the ring.



Yes, motul gear competition.
I don't plan to analyze it.

Sounds good, let us know how the drexler does on track.