Zep
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I guess my point is that I have used the same MOT centre for years and never had any issue and I trust them. It's not something I specifically ask for. And that includes many other LSD equipped cars. Every RWD car I've had bar my yank tank Plymouth had an LSD or electronically activated clutch pack type diff.
The Plymouth was most disappointing when you tried to do a burn out and ended up with a one tyre fire!
4WD cars like my urquattro I did ask/MOT always noted. A novelty on that was that I could lock both the centre and rear diff manually using a vacuum switch. Not to be mucked about with unless you are on a loose surface or stuck really.
Will the past owner of my car and others specifically have asked the MOT tester either, I doubt it.
The difference here is the type of diff. Most will be torque sensing and won’t have an issue. The diff in the GS is a plate type, which uses clutches with friction material to limit the speed difference between the wheels. If you turn one wheel and lock the other you wear the plates.
You should do what you want, but it does cause wear if it’s done on the rollers and as the diff is in the gearbox it’s painful to sort out.