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Yes if you actually need to access the cooler, there's no space to get at it from below. No if you're only changing the orings on the hoses on the engine block end. In either case you need to take the undertray off of course.

It's a fairly easy job although does involve draining the oil so gets a little messy. Once the oil is out the oil cooler hose is easily accessed from under the car. I switched the oring over and used a bit of PTFE lube to ensure it fitted smoothly. https://www.polymax.co.uk/o-rings/rubber-viton-orin...

So I measured the o ring as accurately as possible with some verniers and contacted Polymax who recommended FKM Viton o rings for use with engine oil and high temperatures. Got them earlier this week and fitted today, so far so good. I'll keep my eye on it but assuming the leak doesn't return then t...

By the way, is there any seal on the engine block side that needs addressing? Or is it just the o ring on the hose connector?

Yeah I found that post, it was boombastik. I've sent a PM in case any are still available. Fingers crossed.

Audi want £39 per o ring

So looks like this leak has returned. As Doug noticed it looks like the source is where the oil pipes connect into the block but oil has got all over the place so can't be 100% sure. I'm going to change the o rings as this seems like the best bet.

That new owner would be me It was a pleasure to meet Doug today, looking forward to picking the car up soon.

Hi guys,

I'm after an original B5 RS4 airbox. I'm hoping someone has one lying around after switching to something aftermarket, happy to pay of course. If not, anyone seen one for sale somewhere?

Thanks!