Did the obvious checks when I bought it. No residue in the oil, antifreeze is perfectly clean, nothing I found while checking it out.
But I notice that it smells a bit rich while it's idling and also occasionally I'll see a little bit of smoke as I accelerate from a stop and ONLY in first gear. Was worried it could be the head gasket but there are literally zero symptoms of that. Runs nicely at a low temp, no power issues, coolant and oil are completely clean, etc.
Is this just normal for a Nissan? I've only ever had BMW's so I have nothing to compare this to.
Mileage is 80,000 miles. No visible leaks in the engine, records showing all oil changes and maintenance, I'm stumped.
You guys are the knowledgeable crowd. Any thoughts?