Essex specialists - oil cooler content :)

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Cost? Hassle?
Lots of reasons - after all the cooler will last over and above the warranty so after that you get to charge for a new cooler setup. Car manufacturers are not interested in making a ca that runs faultless for ten years.

[murph7355]

Cost? Hassle?
Lots of reasons - after all the cooler will last over and above the warranty so after that you get to charge for a new cooler setup. Car manufacturers are not interested in making a ca that runs faultless for ten years.

I hear you.

But am still not convinced there's a solution other than to use ali' all through. And the longevity of that sort of setup is unproven.

Anyway, key thing is the car's back and working fully

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Cost? Hassle?
Lots of reasons - after all the cooler will last over and above the warranty so after that you get to charge for a new cooler setup. Car manufacturers are not interested in making a ca that runs faultless for ten years.

I hear you.

But am still not convinced there's a solution other than to use ali' all through. And the longevity of that sort of setup is unproven.

Anyway, key thing is the car's back and working fully

It's not as if galvonic corrosion is new or specific the rs4's
Jointing compound *will* solve the issue on its own as it has proven in other applications.
The silicone tape is waterproof to silly amounts of pressure - you can use it to repair oil/coolant/mains water pipes and it provides a solid seal (when fitting it fuses together into a single piece - just ask anybody who uses silicone swimming hats ). Given this it should have zero issues stopping water spray getting in.

Finally, whilst you could use Ali connectors I can't recall ever seeing an Ali oil line. My guess is probably not strong enough when braided? Anyway, this would move the issue at least away from the cooler.