u/Automatic-Buyer-4522

So I have a 325i n52b25 Aus market with 200,000km and have an over fuelling problem with only cylinder 5. No misfire idle is smooth and only cylinder 5 spark plug got covered in fuel build up stuff which is why I’m assuming only cylinder 5. It also isn’t the injector because I replaced all of them. My next theory is that it is a wiring issue somewhere or some connection is being interrupted and electrical is not my strong point. Is it at a point where I get someone who knows what there doing to look at it. Any recommendations are greatly appreciated.

I’ve found some usual head gasket milkshake looking residue under the oil filler cap on my BMW 325i N52, mostly around the cap and filler neck. The actual engine oil doesn’t appear fully contaminated, and the coolant level has stayed stable with no noticeable loss. The car isn’t overheating and runs normally. From what I’ve looked into so far, this could be condensation buildup as this is the first time car has ran in a few weeks, but I’m trying to rule out a possible head gasket issue. Has anyone seen this before on an N52, and what’s the best way to confirm whether it’s just condensation or something more serious?