So I changed the oil a while back, putting 10,065 miles on it over 19 months. This oil change included a good bit of not so long trips and very little engine block heater use(since it wasn't installed until the last 2000 miles of it). I'm thinking of shooting for 13K miles this time around.
I was using 0W-20 Pennzoil Platinum full synthetic oil and a fram ultra synthetic filter.
Here is the analysis results from blackstone.
