I'm just about to install new extractors ... and I thought it might be useful to replace the manifold studs and copper nuts. I'm wondering if the manifold studs should have any sort of anti-seize lubricant on the thread that goes into the head?

I've read copper antiseize wont last with heat. Also read that metal based anti-seize can damage O2 sensors.

Wondering if ceramic grease (the kind used for brakes) should be used? Or just thread them in neat.

Think about it. How is it going to get to into the exhaust system on a mini unless you covered absolutely everything in it? That means there can't be an issue with O2 sensors.

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1986 Mayfair (998 auto), 1974 S, 1974 Van, 1972 PMG Van

Too many minis

I was under the impression the idea of brass nuts on the exhaust was to prevent corrosion causing the nuts to seize so nothing else is needed.
Interested to hear if I'm Wrong,

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Mk 1 Cooper S 1965
If you could erase all your mistakes of the past
You would also erase the wisdom of your present
Remember the lesson not the disappointment.

Its the thread going into the head... I'm just trying to avoid any potential future pitfalls more than anything.

You're probably right 68+86Auto.. if the cooper grease does melt.. its fairly unlikely to enter the manifold.

I've anti-seized pretty much every fastener (unless threadlocking required) on my cars, including those with sensors, for decades with never an issue.

It's so nice to simply just undo something years, even decades after you've fitted it...

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Cheers,
Rod.
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'63 Morris 850 (Old Secondhand CAR)

Yep, doesn't do any harm. It will never reach the cat; it seems to specialise in getting into your mouth more than anything.

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SooperDooperMiniCooperExpertEngineering

All garage work involves equal measures of enthusiasm, ingenuity and a fair degree of irresponsibility.

I use the nickel anti seize now.
I had copper anti seize on the LCB Y piece and had to cut one pipe to get it off.
Too hot there for copper.

Edit
You don't need it on the manifold studs into the head. Or on the brass nuts either.

VW beetles used it on their exhaust studs, but they had steel nuts.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.