Okay, things seem to keep breaking at the moment... I took in my S3 for a warranty replacement of the alarm siren (it was bleeping 4 times every morning), which they did. They said that they couldn't find any DTC's, but as I only had 1 day left on my warranty, they'd swap it anyway. However, I also asked them to look at what i thought was oil spray on the bonnet. They came back to be saying that they had checked all around that area, and not found a leak. They said that the spray was likely to be tree sap. Okay. I'm kind of sure that tree sap isn't brown and oily.... and it doesnt spray up the bonnet when driving... So slap number 1 to Audi i'm afraid. Has anybody any knowledge of any particular weak points in the hoses to check? I've got a nasty suspicion that it's going to be a minute split somewhere, as performance isn't noticeably imparied, and the spray only appears after giving it some beans.. that, or its a small puncture in an intercooler... any pointers to check first before i rip the wheel liner and bumper off?