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The OE oil is Shell SL2808 but is a bit of a mare to get hold of. MG dealer service departments can supply it. Apparently it is Shell E6 iX which is, I think, a 75W oil but specifically for wet motor EV applications, so is likely non-conductive.

This is what the dealer (Apple MG) told me earlier this week when I asked them to change the oil. I shall do it myself soon.

Beware tinting the front windows since anything beyond ?20%? will not be legal.

Rinse, shampoo, rinse, then either dry and paste wax (monthly) or Meguiars hybrid ceramic spray, rinse again as per instructions and dry.

Hmm, that's disappointing.

I make the trip from London to Aberystwyth semi-regularly and it's fine. I leave with approaching 100% charge and charge again at Severn View before heading over the bridge. After that I don't need to charge again until I get to Aberystwyth where there are a few chargers (Morrisons has a high...

I seem to remember that switching to taking time from DAB/RDS rather than GPS avoids this issue.

B&G stock the correct oil. edit: didn’t see that others have already posted this. My bad!

The test unit was filled with 900ml…

Well, that is indeed interesting. That's far too much to be a bit of foam and/or mist collecting but definitely looks like the unit is expelling liquid. It's weird because the unit I tested didn't do that.

Ooh, that's interesting. When you say "solid with oil" do you mean its a clearly visible oil film or that the tube is full at the low point, like a sink trap? If it is indeed full then there's no way that is mist or foam but is definitely fling from the gears...breather is in The Wrong Place (tm).

When you removed the old extended one you constructed, was there any oil present on the inside of the tube? I don’t mean a visible film but any at all, perhaps detectable with a Q-tip? I wonder if it is an oil mist which then “condenses” in the breather cap. That said, I suspect a very good...

My 5 is definitely not crap. Everything is bolted where it should be and all the oil stays inside it, it doesn’t lock me in or try to steer for me. Power and performance is perfectly fine, although the supplied tyres are rather horrible but that’s easily fixable.

Lots of diffs do have vents but also others don't. Anti-foam agents in oil are used to prevent a head of foam on the top of the oil bath since this would fill the top of the case if it were bad enough and then come bubbling out of the vent...it doesn't stop air bubbles in the oil itself but...

Likely more to do with the bore being larger I would think.

Not really, since with a narrowish tube the surface tension will hold the oil there. Anywaysup, the solution is pretty straightforward; a breather tube with a reservoir/widening/bottle to allow the air to escape and the oil to drain.

Precisely so. One poster on here has shown their large tube solution and I would imagine that would work pretty well. Or use an expansion vessel to allow the air to pass and the oil to drain back.

No, the 5 has a very similar breather to the 4 (but plastic) directly on the casing, albeit not in line with the ring gear!

Oh, OK. That's only about £7500 since Brexit happened.

Pretty but £££