Anyone notice stinky exhaust?

[BoxMN]

So our '97 merc 150 efi runs great. But recently my bro noticed it smelled a bit like deisel or something stinky... It is not horrible, but noticable. Called our mechanic, who we trust, and he just went through a few questions, as we thought maybe our oil injector was out of whack or something... when my bro mentioned the exhaust smelled a bit like diesel or something, the mechanic said he knew exactly what it was - some blend of gas that was just enough funky or different that we noticed it. He said he can smell the difference too with different boats/gas.

Anybody ever notice that before? I think it wass the first time I have ever noticed it. He said just go to a different station, and use non-oxy whenever we get the chance, but that is was most likely just a funky blend of gas, and not to worry about the oil injector, as if it does go, it DUMPS oil in to protect the engine, and then there would be no question on if something is wrong, he said it would be so smokey people would be coming with fire extinguishers but it is just to protect the engine.

Anyway, just wondering if anybody smelled this before, or to let people know what we found. It still starts and runs great, even got 51 on gps the other day, which is fast for our tub of a boat. Good luck.

[jeffreyd]

almost a varnish smell? I call it Pemex gas as I can usually smell a vehicle that has mostly used fuel from Mexico. It has a heavier exhaust smell compared to gas that we use. What if you try some different fuel to see if it goes away?

[BoxMN]

Yep, that is what we are going to do. Get all the existing gas out, then start fresh from a different station, using nonj-oxy gas when we can.

[Ralph Wiggum]

Never with the boat, but certain gases tend to smell funny in my truck, especially when towing or accelerating hard. Doesn't really seem to affect it otherwise, but I notice it.