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.
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.
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.
I suppose I should ask "Who doesn't have a Whine" ?
2019 270S 1.6
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..........
crown wheel turned in.....redline heavy.......no whine
so what backlash are you now running Tom..?
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?