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Title says it all. If I have a techmarine can he repair anything that is allied in from another codex?

Thanks.

I don't believe there's anything restricting it - his rule says "friendly" vehicles if I'm not mistaken. That said, being an ally means he can't actually hop on board any allied transports.

Friendly vehicle would mean it would have to be a battle brother tho,
Since all other allies are still treated as enemies

All friendly vehicles. Might get changed in the future, but right now, all friendly vehicles.

Nope (from the end of the BRB faq)

Q: Can models from an Allied Detachment that have the ability to repair Hull Points or Immobilised/Weapon Destroyed results from the Vehicle Damage Table use this ability on Allied vehicles? (p112)
A: No.

So it doesn't matter what level of ally they are, the mechanics of their systems are too different (righty loosey opposed to lefty loosey)

But if they both have the same chapter tactics I would say they can as it says something to the effect that "blah blah" I don't have the book

I looked this up because I had a battle brother tech marine follow a demolisher with a PFG

(Any spelling mistakes are the fault of GW as I copy/pasted from the FAQ)

Portuges is correct, I believe. If they are different chapters with the same Chapter Tactics in the same detachment, they're fine. If they've got different Chapter Tactics, and thus different detachment charts, they cannot. (Unless I'm wrong in how the FAQ applies.)

Well spotted, portugus. Different Chapter Tactics detachments wouldn't allow it then, as these are still an Allied detachment - the FAQ doesn't mention anything about being from the same Codex.

Keeping in mind I don't have the Space marine book, I thought it said marines with the same chapter tactics are counted as the same army. I would think it could work if you have the same chapter tactics but like i said i don't have the book so cannot read that part.

That's not exactly how that bit works. You choose a CT for each Space Marines detachment, whether primary or allied. The normal rules would then normally prevent you from taking an allied detachment from the same Codex - but the Codex then overrides this by saying you can ally with a different CT detachment. There's still no permission to ally with the same CT (normal rules also forbid this for double FOC as this states both primary detachments must be from the same Codex).
The only other mention it makes is that "you may field models from two different Chapters that have the same Chapter Tactics (such as Ultramarines and Praetors of Orpheus) in the same detachment" (emphasis mine) - that's just to cover different colour schemes.