Oil Analysis Help

[Boardingnath]

Hi All, had my oil changed recently and took the chance to send a sample off to Millers (very fast service by the way)

I've spoken to them and they said that the metals count was low which was great news as this was the original reason for getting the test done. They did mention that the fuel dilution was higher than expected (came in at 1.7%)
Any thoughts on what could be causing the high fuel dilution? Car is driven regularly and commute is usually at least 40 mins, so is not used for short journeys. Is this anything I should be worried about?

Car is 2008 Porsche 911, 997.2 model. Has 62k miles.

Full results below -

Chrome 1
Nickel 1
Tin 1
Boron 101
Iron 11
Molybdenum 40
Silicon 3
Aluminium 5
Copper 3
Sodium 6

[99hjhm]

Without comparing it with another Porsche engine, you never will know.

It’s a flat engine so might have small effect, I know they don’t like a few cold starts in a row.

[GreenV8S]

I don't know what's normal for that engine, but 1.7% doesn't sound alarmingly excessive. I thought the typical threshold for concern was in the region of 2 - 2.5%.

The low metal counts suggest that whatever is happening isn't causing any lubrication failure.

[spitfire4v8]

I don't know how these tests work, but Is the sample from oil drained from the sump, or from inside the filter. Any larger metal particles hopefully wouldn't show up anyway if the filter was doing its job .. a sample from the filter element would be interesting as a comparison?
As for the fuel, even a 40 min drive probably doesn't get the oil hot enough to burn anything off unless every commute is a hoon ?

[HJG]

I would not worry about that fuel dilution.
Around 2.5 to 3% is more serious as the oil will drop one SAE viscosity grade at this point.

Fuel dilution can be higher if the engine has not got hot for a while or has had prolonged idling before the oil sample was taken.

As a side note I've seen 8% fuel dilution before. Copper content looked normal. Tested again after some more running and fuel was 12% and copper had gone up massively. Pulled the engine apart and big ends were about to fail.

[Grayedout]

All results look fine to me

[GreenV8S]

HJG said:

As a side note I've seen 8% fuel dilution before. Copper content looked normal. Tested again after some more running and fuel was 12% and copper had gone up massively.

Was that much contamination enough to be noticeable without the test?

[MatrixXXx]

I assume its got to be fuel getting past the piston rings? to much ideling, it used to be a problem when cars had a chokes and piston wash.