FlatSix911

Thanks for the comparison data
I am going to change the oil and then re-sample after a thousand miles to see if there is a trend.
The Blackstone tech I spoke with thought a common source of Copper in our cars can come from the oil cooler?

No HTwo O

I think 1,000 miles is too soon. Just do it at the 1-year mark, and retest. Then see if the copper is going up, down, or holding steady.

Flying Finn

The time limit is not about oil getting bad, it's about moisture in the oil which can corrode internal engine parts.
This is especially if the car sits long times in an environment with moisture in the air and/or temperature changes from below freezing & above.
When you drive the car (for a while, starting it or driving for 5 minutes is not adequate), moisture in the oil gets "burned" off.

Stealth 993

It's also a lot about gas & other acids in the oil, they do more damage then water. People how just start the car & let it idle a lot get a lot of gas in the oil, from the car running rich at cold start, this helps create acids, that do real damage.

ilko

Here's my latest report. Last week I started the car for the first time since late December. After it warmed up I took a sample and sent it to Blackstone. I didn't change the oil and was curious how it's doing after a year in there. It seems everything is fine. I'll send them another sample in 2K miles as recommended. My engine currently has 107,455 miles and uses a quart of oil every 2400-2700 miles. My previous report is on p. 2 of this thread.

FlatSix911

Here is a interesting article on the Oil Analysis process at Blackstone

FlatSix911

Here are the oil analysis results from Blackstone:

After another 1,500 miles the TBN (Total Base Number) is still strong at 6.7.
I would appreciate feedback on the reported high Copper level (23).
Does anyone have similar numbers for Cu? Worn valve guides?

No HTwo O

Flat6, when I look at my UOA's copper is 7 (Boxster, +40K miles and about 7K drain intervals) and the Turbo is 5 (+45K miles and 5K intervals). You are also consuming 2 quarts of oil during your interval. High, but not completely out of spec.

I do not need to add oil between changes.

FlatSix911

NoH2O, thanks for your feedback.
Any others with air-cooled engines?

axl911

Started doing oil analysis 10K miles ago with 5K miles oil change. My Cu content for each of the 5K miles is only 10.

Yours seemed high. I would definitely do another analysis in another 1-2K miles for several cycles to see if/how the values increased.

You cut open the filters to see if you find metal or copper particles?

ilko

Those numbers are high, change the oil more often and see how it goes. Just FYI, here are the reports from my supercharged RSA that I did quite a bit of track time with.

The first one had Castrol and I was not happy with what I got back...

The second one was Sean Penn and the car did much better. Lead was a little high because I ended up filling up with 100 octane leaded gas a couple of times at LRP (no cat):

PiB993

Thought I would throw my 2-P into the thread. I'm worried about copper and lead. The mileage on the first test lists 3000 but it is likely more. Then when I had some oil pulled (not sure how the mechanic extracted it - may effect values?) and filled out the paper work I didn't realize I had put less than 1000 miles on the car.

Cupcar

I use Blackstone and the most interesting comment that has come back is that they predicted I needed an air filter change due to high a Silicon content in the oil.

PiB993

Do you recall the mileage on the filter and silicon value?

Cupcar

On my wife's Mercedes at 44,000 miles, Si = 14