Wayne Smith

2010 C4S PDK that just passed 97K miles.

Yes, 6500 miles. Life has been too busy. I needed this last trip to unwind. I did not get to the oil change before leaving. Yes, that busy. The last change was a full 9 weeks ago.

A while back there was a thread wondering about metal in the filter. Below is a picture of mine ... after 6.5K miles including trips through Death Valley and to Oregon (home base is the San Francisco Bay Area). The picture was taken in the sun to allow maximum reflection.

For the first time in my 62K miles of stewardship my drain out was a pint under the 7.5 quarts I put in at each change (none added in between). But the last couple thousand miles was spent mostly above 6K with temps approaching up to 250F. And I was a bar down on the display.

docdrs

Looks good to me

vg247

Looks nice and clean, thanks for sharing

Petza914

Looking good Wayne.

Bruce In Philly

Hmmm.... Let's see....... Hmmm.... Ok, no dead mice, lost keys, old girlfriends, M&Ms,......... I dunno Wayne, you just can't be sure.

Peace
Bruce in Philly

the_buch

Looks like the filter didn't have too much to do other than get a bit of dirt/carbon out. What oil are you using for that sort of mileage and at those operating conditions?

Wayne Smith

At the risk of turning this into an oil thread (please no ... just no), Mobil 0-40.

In the hopes of keeping this technical ...

My 5 day a week commute is 25 miles each way in temperatures from mid 30s to low 100s with winter rains in the cooler months. Oil temps can get to 210F in the hot months and only 175F on cold rainy evenings.

I try to get out for 50 or more miles of twisties each week. Oil can reach 225F in these cases.

And on occasion I am honored to take trips with friends (generally about 500 miles a day for multiple days). I've never worried about water accumulation.

We used to use the 997 to commute up and down California for visits but since we got Pam's GLA 45 the 997 sees more garage time.

This last trip (last week to Oregon) saw a couple 600 mile days with oil temps hitting 245F heading up Mount Shasta on the return leg.

I believe my longest day with the 997 so far was 700 miles driving through mountain passes in the Sierras.

In other words, the oil gets exercised and changed every 5K miles (every couple months).

The drained oil has always remained clear, although a bit darker than new. I pour it into my recycling buckets in the sunlight and have not seen any metallic luster. I have not sent it in for analysis although I know I should.

I was quite pleased with the filter and posted the picture for Bruce who wondered about his a while back.


Note ... The car is fairly stock ... No third radiator. Oil temperatures vary more than I would like, but that seems to be the way of these beasts. It's a choice of more weight in the cooling system or less stable temperatures. We're already pretty heavy.

As a comparison, I can run Pam's GLA 45 gently or full out in the heat or the cold and see only a 5F variance in oil temperature. But AMG is pulling 380 HP from a 1.9 liter motor so I suspect they want the tolerances to be much tighter. They put the extra weight into the cooling system so that the thermostat could do its job, IMHO.

Mike Murphy

Looks good. One question: how do you know what your oil temps are? My car (996) only has water temp gauges.

DC911S

the 997 has an oil temp gauge.......it's a bit dubious on how accurate it really is.

Mike Murphy

Thats interesting. Do you also have water temp? If yes, how does oil temp compare with water temp?

Wayne Smith

The water temp is an idiot light kind of gauge. It goes to 175F and stays there no matter what. Some have hooked up to the OBD to read in real time what the actual temps are. 175 is not the real value!!!

DC911S

Fluid temps vary quite a bit according to engine speed, load, outside temps, humidity...etc....if the temp guage actually showed the instantaneous values.....people would freak out. So they get smoothed over via some function written by a software geek. Ask anyone thats written code or worked in a control environment.

Bruce In Philly

Maybe..... but I think has more to do with where the sensors are located.

My oil temp gauge moves all over the place in the summer and that bothers me and others on this forum. Why fake the water temp and not the oil temp?

I think the sensors for water are after the radiators and not what comes out of the block... but I can;t make heads nor tails of the parts diagrams regarding sensors. When I sniffed the CAN with my Durametric live values, they showed a bunch of water and oil temp buckets... some worked others returned junk..... In short, not enough information out there on the sensor locations and therefore we can;t make judgements that Porsche is faking water temps. I for one, don't believe Porsche is faking the numbers.

Peace
Bruce in Philly

DC911S

Its not fake, its smoothed out so that its not jumping around.....which would freak people out even more. Its getting data at some sampling rate.......that data gets smoothed by some transfer function....and that gets displayed.

Wayne Smith

I've designed control systems for almost 40 years so I understand the idea of data smoothing. But I have a hard time imagining that the water temperature is always exactly 175F while the oil varies from 175 tho 250 for extended periods based upon driving conditions.