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FYI - its looking like its a inlet manifold gasket, mechanics having a look see on Monday - apparently a common fault in Commys.

Hmmmm - I like the sound of this better than the post above you.
Coolant is nice and clean, as is oil. Never overheated or had any heating issues.

Will give the coolant a flush out and going to...

3.8

I've seen mentioned online that they run a trans cooler down the side of the radiator as part of the radiator, and this can leak into the water.
Will check that tonight - cause I'll put a...

Yeah that's whats freaking me out.

Was just checking water before heading out for the weekend, and noticed white paste on both my radiator cap underside, and the dipstick on the overflow bottle.
Cleaned it up and its not come back...