Engine Oil Extraction by Vacuum Pump

[Pickled Piper]

I am contemplating an additional oil change for my 993 after each track day. Now, I really don't fancy doing the full monty oil change with filters every couple of months as the car gets regularly serviced anyway and changing filters etc would be overkill.

I have a marine vacuum pump that I use to change the oil on my other cars. You simply poke the tube down the dipstick hole, pump it a few times, go have a cup of tea and on your return the sump is empty. Now, how well would this work on my 993? I know I will not be able to extract all the oil as some will be in the oil cooler circuit and some will remain in the filters and so on. Any educated guesses as to what proportion of the total oil capacity i would be able to suck out this way?

Cheers

Taj

 

[Richard_Hamilton]

I would imagine that the oil tank holds about 6 of the 9 litres used in an oil change, as the workshop manual shows the following:

"Fill with approx. 6 liters of engine oil. Run engine at idle and top up with approx. 3 liters. The oil change capacity is approx. 9 liters."​

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It would be logical that you fill the tank, run the engine to circulate the oil, and top it up to capacity. That would leave 6 litres in the tank, and 3 litres in the rest of the system. Just my best guess.​

 

[Sundeep]

ORIGINAL: Pickled Piper

I am contemplating an additional oil change for my 993 after each track day. Now, I really don't fancy doing the full monty oil change with filters every couple of months as the car gets regularly serviced anyway and changing filters etc would be overkill.

I have a marine vacuum pump that I use to change the oil on my other cars. You simply poke the tube down the dipstick hole, pump it a few times, go have a cup of tea and on your return the sump is empty. Now, how well would this work on my 993? I know I will not be able to extract all the oil as some will be in the oil cooler circuit and some will remain in the filters and so on. Any educated guesses as to what proportion of the total oil capacity i would be able to suck out this way?

Cheers

Taj

if you were seriously driving your car longer and harder, then assuming you are servicing every 12k then change more frequently say every 6k ? or even less depending on the track mileage but otherwise a better oil would be more worth while than more frequent changes..... can't really see the point after every track day IMHO