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ScottR400D
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Yes, of course. It's £2k + with an LSD. 

I should have known! I bought one and had an SPC LSD fitted to it just last year! £1160 at CC.

Anyway, still a fair bit when the odds are it won't help, IMO, but I'm sure we'd all be interested to see if it does make a difference. 

Geoff Brown
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After my Steve Perks (Tracsport) LSD overhaul I filled with Castrol B373 SAE90 GL5 LS oil (down graded from GL6 to conform with latest oil ratings). Steve commented that this was OK & as good as any other mineral based LSD oil.

Some times there is a discernible whine & some times not at certain RPM & speed when cold. When fully warmed up no whine at all.

Being a full mineral oil I intend to change frequently.

Benton
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I've recently changed the oil twice in the last few months in my Sierra lsd diff.  The original oil was mineral based (make unknown).

I first tried Motul synthetic (the Caterham endorsed one) and then tried RTT mineral based oil.
I'm convinced the diff runs more smoother/quieter with the RRToil than the Motul stuff but then I don't have significant whine with my diff.

 

Beagler
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I suppose I should ask "Who doesn't have a Whine" ?

2019 270S 1.6

ScottR400D
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Good idea! I don't know, I can't hear for all the other noise and my earplugs!!

Actually I get low pitched 'gear noises' from my diff but not what I'd call a whine, or at least not a significant whine. I get chatter from the diff on light overrun and overrun noise from the gearbox. 

All that mixes with the induction noise and exhaust but otherwise the car's quite silent..........

Beagler
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Rofl

2019 270S 1.6

Tom_Arundel
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crown wheel turned in.....redline heavy.......no whine Bowtie

7 wonders of th...
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so what backlash are you now running Tom..?

ScottR400D
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A good question. 'Crownwheel turned in'? Does that mean backlash reduced or what? How do you do that?

I know some diffs allow for backlash adjustment by adjusting the preload on the bearings but with the BMW it's a matter of adjusting shims isn't it?