Here is my report from back in February. I drive about 5 miles per day, so the oil doesn't really get warm. I do try to take it on longer trips or have the wife take it to work at least once per week. I try to change it at six months, but I got lazy and actually went seven months and about 2,900 miles. Overall, the report does look pretty good. The filter was a Mazda OEM unit.
I'm doing some contract work that has me driving 52 miles each day, so the next interval should be higher miles, but under better driving conditions. Twenty of those miles each way is often the HOV lane, so a steady 65-70 miles per hour is the norm a couple times per week. I have another round of PP 5W-30 in there now with a Napa Gold filter.
The presence of fuel is a common theme with these engines. I don’t know how much it affected wear. The interval was short mileage-wise, so I’m sure that had some effect on the low wear numbers. I will be curious to see the next report with my new driving conditions. I’m thinking about 4,000-5,000 miles for an interval.
