lowbee

So I had a new shop changed the oil on my 997.1S yesterday, I told them to put in no more than 8 liter (8.45 quart) thinking I will top up if necessary and I watched them put in 8L. So I checked the oil after it was parked for 2 hrs at work, everything is fine, oil indicator is at max but not over filled (top most segment NOT lighted up). I checked the oil level again at a different parking spot at work today and it is showing over filled. Now I know my garage is slight sloped down towards the curb (like any other garage for water drainage) and when I parked the car overnight with front of the car towards the curb (nose down) and checked the oil in the morning, it is showing over filled (top most segment lighted up). When I parked with the back of the car towards the curb (nose up), oil indicator is at the max (top most segment NOT lighted up), this is telling me the car could be marginally overfilled..... Here are my options, what should I do ?

1. Do nothing and let it burn out, the 100ml (0.1 quart) overfill shouldn't hurt anything
2. Go back to the shop and have them unscrew the oil filter then dump the oil from the filter
3. Go back to the shop and have them unscrew the drain plug and let some oil out. (Can I reuse crush washer and drain plug or do I need new ones ?)

dgjks6

Unscrew oil filter and back in

deptotpr

Drive fast, high rpm on your way to work tomorrow, and it should be good after.

LexVan

Do #1. If you're completely AR do #2.

dgjks6

Do the .1's still have a dipstick?

LexVan

No.

bheit1

I pulled into a gas station a while back and checked the oil before I shut the car off. Like yours, it showed the top level of the gauge full. After filling the car I started it again and checked the oil. It registered right where it should be. I don't think it hurts to let the engine cool down for a bit before checking the oil.

rtl5009

j beede

Assuming a stock filter canister... jack up the right rear and drop the filter canister yourself. Empty it and screw it back on. The torque spec is molded into the cover. Job done. Ten minutes including putting the jack away and tossing the drain pan in the dishwasher.

My 997.1 doesn't consume oil (if it does the lost oil is replaced with coolant or gasoline I suspect). If I left it overfilled it would stay that way until the next oil change.

I don't think Herr Doctor Porsche would approve of the high-rev-on-the-way-to-work method of adjusting oil level.

FYI: I believe RED offers an old school dipstick option during rebuilds.

karl1672

Interesting. Mine doesn't seem to use any oil either. When I check it (cold, same spot in the garage), most all the time it reads full but will occasionally read over.

LexVan

Most don't use oil. And the minute amount of oil that you might be consuming, is replaced by moisture in your oil. So net-net is stays pretty full.

karl1672

Petza914

Don't ever check the oil in a .1 any time other than before the first start of the day on level ground. Any readings done other than before the first start aren't worth anything because there's the variables of oil expanding with temperature and how much is left up in the motor that hasn't returned to the pan.

Running it overfilled at high RPM when the vacuum is the highest is a great way to finish off your AOS membrane, so don't do that option. The drain plug option isn't a good one either.

Do the remove filter canister, dump, and replace option.

Bruce In Philly

As I understand it, overfilling oil in Porsches is the same as any other car..... you want to prevent foaming. To prevent this, we have a "full" mark in our guages, an air-oil separator, and the oil companies put anti-foaming additives in the oil. If overfilled, the spinning crank can dip into the oil pool and whip it up. Bubbles in oil is bad as it creates points of non-lubrication. IMO, our sports cars are designed to take quite a bit of oil sloshing. I remember seeing an engineering spec revealed in a Christophorous article 20-some years ago.... or maybe they alluded to it, but the engineers are provided with a set of specs for design. One of them include the lateral/forward/back g-forces the engine will have to endure... including tilt angle (going up a steep hill etc.). Given a max lateral force, the oil, coolant, chains, sprayers, etc. will have operate properly under say 1.x G of lateral force... a sprayer must hit its target, for example, or oil can't slosh beyond a certain point etc. etc.

IMO, one bar over fill is no issue. I suspect we are way within spec. Unless of course you put on slicks and head to the track... then maybe you will get slosh that goes beyond spec and then maybe something bad will happen.

Full disclosure: I am totally speculating..... I have slightly overfilled my car a few times...... oh, and back in the 2000s, dealers chronically overfilled our cars... I don;t know why but they did and it was a common post back then.

Peace
Bruce in Philly

Petza914

Completely separate from the lubrication issue you mention which are valid points and why good deep sump kits include windage trays, overfilling the oil in a 911 can lead to premature AOS failure when the vacuum for crankcase ventilation that goes through the AOS pulls in actual oil instead of oil vapor. That's the reason you don't want to overfill a 911, not because of the lubrication and oil foaming, though those are other reasons as well.