oil change differences
 

So last oil change I put in 8 quarts and was low. Had to add a 9th
Yesterday added 8 quarts was over full

Both with timed 20 min drain interval

So much for the state-of-the-art German over-engineerng syndrome. Just give us our dipstick back.

Yup, same for me.... I just measure what I take out and put the same or a bit less in. Seems to take a few readings to "stabilize: whatever that is.

Peace
Bruce in Philly

I understand the 20 minute interval was the same, but that's not really long enough - needs an hour. Are you draining warm or cold?

This time let the car idle a few minutes. Last time no idea. Could have been up to temp or maybe just let idle or somewhere in between

Interesting fact. I just got another 997.2 repair manual. This one has 14,000 pages. It describes how to do an oil change but does not give a drain interval.

And it says the oil capacity of the engine in 10L

Attachment 1291660

So at best we are only removing 75-80%

On my 997.2 I fill to 7.5 quarts after draining warm for at least 1 hour, and then check it to see where its at. I usually only need to add a couple of ounces to show 1 bar off the top.

7.5 out, 7.5 back in. 997.2 with 16 oil changes that I've done over the last four years and 82K mikes.

Measure oil level before draining. Measure the drained amount. Figure what you want to add. Better to be a bar (or two) low than too high.

Never burned a drop of oil? I'm at a quarts every 3,000 or so miles

Acquired stewardship at 35K miles. 117K four years later. 2010 C4S PDK.

In equals out within measuring capability. I use old empty 5 quart jugs to measure oil out (and recycle).

Drive times are enough to burn off moisture.

So practically speaking, never burned a drop.

The 9A1 varies, but others on this Forum have had similar experience.

Off topic but since its my thread I'm going there. 20K+ miles per year - what tires do you run? Do you do 2 sets of rears and 1 set of fronts every 20K? I'm asking because I do similar mileage and switched to all season tires on my 996 because I was getting sick of spending that much on tires and kept will all seasons from my 997.

Wow, these cars can hold 17 quarts of oil? I'm pretty positive that's overfilled. :D