'96 Miata 147k | Rotella T6 (SM) | 2052mi w/ HPDE

[anthonym6]

1996 Mazda Miata
147k miles
2052 miles on oil including 1 track event (~300 miles). This is the previous blend of Rotella T6 (SM). Using a WIX 51356 filter.
Car has been on track multiple times per year since I've owned it (2010). Engine is not modified. I put anywhere from 3-5k miles on the car a year. Usually about 2-3 track events in that time.

 

[zeng]

You could've done longer intervals.

 

[anthonym6]

This was a baseline as I have never run a UOA before. I will most likely stick to a yearly change no matter how many track events I run.

 

[Johnny2Bad]

Looks like excellent contaminant number to me.

A little concerned about the reported viscosity @ 100C, should be minimum 12.5 maximum 16.3. Seems like your oil is grading to a 5W-30 (9.3 to 12.5). As SAE viscosity grades are not optional (in other words, you can't rate an oil SAE 40 if it doesn't grade SAE 40, and yours doesn't), after such a short mileage and with a synthetic base, you wouldn't expect it to grade SAE 30, which it does. Interesting. Also I'm confused by "viscosity within specified operating range" when it's not grading 40. Do they expect it to lose so much viscosity after just 2000 miles?