Water in the oil?

[Jerome74911S]

I just drained my oil. I never drive my car for less than a half hour, mostly longer, so the oil always gets hot.

What does this rust on the drain plug indicate?

[RedCoupe]

When you drained your oil did you see any water when you first removed the drain plug? I used to live in the Seattle area, and the first couple of oil changes I did I got some water coming out ahead of the oil. I shortened my oil change interval until that didn't happen. Remember, water is one of the products of combustion, so that coupled with condensation on the cold engine parts means you are likely to have some moisture in your oil. Getting the oil hot really helps this problem, but how much of a problem this is has a lot to do with your climate. In cool weather, a 911 has lot of oil to heat up! Also, an engine that has worn rings leaks more combustion byproducts into the oil, including water. I wouldn't worry about it, but I would check for water when draining the oil and maybe shorten the drain interval.

[scarceller]

What about the oil filler cap, does it have rust or evidence of water? I line in New England and find that in humid weather I get water condensation at the top of the filler neck area after engine cools down. Not much that can be done about it here, sometimes I remove the cap on cool down but you need to remember to put it back shortly after cool down.

[GH85Carrera]

I have heard stories of people that store a 911 through a cold winter getting water in the oil from condensation. Same thing for the gas tank.

I have never experienced it since I keep my 911 in my attached garage and it never gets below 45 degrees in there.

You don't have to get the oil to 212 to boil off the water. Just get the oil in the 180 degree range and the water will evaporate pretty quick.

In the wintertime it is impossible to get the oil HOT. I drove my 911 for two hours when it was zero Fahrenheit and the oil temp never got above 130 degrees.

[KNS]

I doubt that is rust because you need oxygen for rust to form - you're not going to get that at the bottom of the engine, in the upper parts, yes. Not to say you might not have a little moisture in your sump but something has caused it to stain.

[safe]

Originally Posted by KNS

I doubt that is rust

+1
I think its just oil crud / stain.