Well, let's cipher my mileage figures and then factor sumps ..on a per quart basis (if practical).
I'm using my 9k as a standard since I've already done the mileage that way. The assumption being that all subjects went 9k with 4 quart sumps.
10um-149 x 1.25 (4 to 5) 186
15um 58 ................ 73
25um 14................. 19
For the Wix the mileage/sump composite is 3.02
10um 272
15um 106
25um 24
The MC is at a 2.0 mileage/sump conversion
10um 82
15um 32
36um 6
Winner and still champion (purolator actually)
Mel, I'm sure that there's flaws in this type of cross analysis. But what the heck? As you can see, I've manipulated the numbers to make my PureOne look better then the other filters that I could spank
There was no way for me to make the MC look bad. I guess I could say that it's so far out of whack with the rest of the filters ..that it's an anomaly and should be thrown out
.
Blackstone does the TBN method that puts 1 as the cut off level. My TBN was low ..only due to it's starting point of about 12. Otherwise 2.5 would be fine for any other oil after 13 months of use in a 4 season climate. The short trips killed it. I would think that my next UOA will show TBN of about 5 or more over the same mileage.