CT718

New member and brand new 718 Cayman (250 miles). I noticed a puddle under the rear of the car at the exhaust after driving home from work (30 minute drive). I live in New England, so it is cold outside, but my garage is more temperate (about 50-55 degrees)

It’s definitely water- clear, odorless, and not oily. It's coming from the exhaust. You can see there are small drops of water where the clamps attach to a pipe connecting the two mufflers. The pipe is a low point between the two mufflers. I noticed it last night and it is still dripping this morning 12 hours later. The white powder around the water is just salt on the garage floor from my old car and not related to the present issue.

I understand you can get some condensation in the exhaust, but this seems excessive and I'm concerned about pre-mature rusting of the exhaust.

Anyone else have a similar problem or suggestions. I plan to contact my local Porsche dealer service (car was purchased from out of state dealer), but wanted opinions before I contact them. Thanks.

worf928

Water is a byproduct of combustion. Under ‘normal’ circumstances it exits the tail pipe as vapor. However, that requires that the exhaust path not be cold enough to condense the water out of vapor form before it exits at the tail pipe.
In our winter weather 30 minutes isn’t long enough for that.
If all you ever do is 20-30 minute drives then you will always have condensed water in the exhaust.
If you’ve got snow or all-season tires, take a nice, long drive of an hour or more and then see what you get.
Porsche exhaust is all stainless steel. Ain’t gonna rust.

fbgh2o

This is totally normal. I have it as well.

CT718

Thanks for the information. I have on winter tires and it's supposed to be warmer this week. I'll take the car for a long drive and just keep an eye on it.

fbgh2o

Did the same today and got a good 120 miles to heat everything up and evaporate the condensed water in the oil and exhaust.