Nice work, I find the annual trends really interesting as well. Every year seems to have an unexpected surge of a certain brand or 2 from the previous years. One thing always seems constant is that Mobil is hands down the leader with Pennzoil, Valvoline, Castrol and QS generally rounding out the...
Change it bro! Although my Subaru's aren't built or tuned, I change the oil every April and October. It's easy to remember, and gratifying, also oil is cheap engines aren't. That being said 2666 miles on Amsoil is nothing. Just my opinion buy a cheaper Synthetic Oil, and change it out every 6...