my latest report. 10k/Castrol Edge/ PL25288 filter. The mileage gap from 37k to 40k is because I got an 89 performance tune and switched to full synthetic for better protection. Of course I forgot I had regular synthetic, not the extended or premium one, so the results kinda show that. With the cooler weather I did drove “spirited” (no red-line or extended WOT) until about 8k when I realized what oil I had and drove conservative from then on. Also a side note, the oil level started to go down around the 7k mark and by 10k I was at the “add” mark. By not adding oil I feel it gives a truer result. Hopefully, I didn’t do any long term damage to the engine… with the Dexos1 restriction, I will probably stay with the Syn-Blend/PF61 combo @ 5.5k oci.