I did an oil change a couple weeks ago after ~4600 miles, and got the results back from Blackstone (See attachment). Looks pretty good.

I'd like to take some more samples over time, to see how long I can go without doing an an oil change. What's the best way to sample the oil without actually changing the oil?

Can I use a pump through the filler tube or filter housing?

Thanks!

 

I'd ask Blackstone about that.

 

Why?

Oil is cheap. Motors, not so.

You want to extend your motor, not your oil. Change every 5,000 miles. Don't over think it.

 

Oil is cheap, time is precious.

Also, I'm kind of curious to see how a serial analysis will do., i.e., 2000, 4000, 6000 miles (I'm a scientist, love data).

On any other car, would be simple enough to stick a vacuum pump hose through the filler hole and suck up some oil. On the Porsche, I wonder if it will break some unobtainium piece if I do it, or don't do it properly

 

I'm doing this sort of analysis with Blackstone. So far I've done 3k, 4k and next 5k. So far, so good at 124k miles.

Blackstone gave me specific recommendations that I could run the oil longer after my last test which is why I suggested you ask them.

edit: sorry, I didn't read clearly that the last response was from OP...Just do a full oil change along those intervals and send out a sample vs. trying to get one through the oil fill. But that just like my opinion, dude.

 

UOA looks good. P and Zn levels are on the low side.

 

http://www.griotsgarage.com/product/...d+extractor.do

 

It is not possible to draw oil up through the fill tube. I have tried to do this using an extractor. There is an obstruction that prevents it from going down into the engine.

 

Then as a scientist, you'd appreciate and respect having proper and reproducible testing and sampling methods. That's why Blackstone recommends you take the sample from the hot oil stream, after a period of flow. Not in the beginning, not at the end, someplace in the middle. That would be difficult to reproduce with a piece of tubing stuffed down the filler neck.

As an aside, I was finally able to view your report. Nice report. Nice low wear metals. But, you can see the classic Mobil 0W40 shearing. Your viscosities are at the very low end of the spec range. This is why I use and recommend Mobil 5W50. It stays in spec much better and has much better high temp shear. Also Porsche A40 approved oil.

 

Thanks. What about through the oil filter housing? I have a 997.2 so the filter is on top. Can you remove the cover and filter, then suck down through there?


Actually, the reason Blackstone recommends the middle of the oil stream is that the beginning could be contaminated with crud around the oil plug hole. They also say that at the end, they are concerned that you might not be able to catch and adequate amount. There should be no issues drawing it directly from the sump via a vacuum pump.

http://www.blackstone-labs.com/sampling-procedures.php

Thanks! Maybe I'll try that at the next oil change.

 

I have a 997.1 so I don't know about that.

 

Bummer.

Anyone else know if there is a way to sample the oil from a 997.2 (without having to do an oil change)?

I suppose I could do an oil change at 2000 miles, then do the next one at 4000 miles, and so on, but it would be nice to see the same oil over time.

 

Too frequent of oil changes is not good either.

 

Why? Does used oil improve with time? If that is the case... fresh oil is less than good oil.

 

Over exposure to high detergent levels of fresh oil.