looks really good from what I can tell.

What kind of filter did you use?

What was the cost of having this done?

I'm thinking about doing a similar test but to the 7500 mile mark with mobil 1 5w30

I believe the current cost is $22/sample.

You can get bulk discounts

this was with a nissan OEM filter

22 bucks from blackstone-labs.com

not too bad. that's what I use.

is your engine stock? FI? is it a track car that's driven aggressively 100% of the time?

Any other info you add about the mileage of the, the year of the car, engine type (HR/revup/non-revup) would be of value as well.

Thanks.

Not too bad. However, I'm curious at a longer OCI, given the information on the web M1 5w-30 hasn't produced good UOA's consistently.