Also, did my annual oil change today. Car had ~16,000 miles on the oil, Amsoil 0w20 SSO, which I'll be sending to Blackstone to see how the results turn out.
Did the standard drain, plug & fill with more Amsoil 0w20 SSO, car immediately felt smoother again. However, I did make one change - the recommended Amsoil filter, the EA15k09, is very small, and like many people know, the bigger the oil filter the better, especially for extended drain intervals. Did a little digging and it turns out the
EA15K51 also fits the Corolla and is a much bigger filter. (I already do this with my Evo, using the EA15k20 instead of the recommended EA15k13).
Not sure how many people are aware, but Amsoil dropped a lot of their EAO oil filters - a much higher quality filter, better made and better filtering, and a lot of the EA15k's dropped in size when the EAOs were out. Using a bigger filter if possible is definitely a good thing, so long as it fits.
I didn't take any exact measurements, but the EA15k51 is significantly larger than the EA15k09. The only thing I was concerned about was the diameter, which I thought might be too large both to fit and to seal properly. I think it turned out just fine though. I'll monitor for leaks just in case. It just BARELY fit in the space though. Pics below!
trans fluid next! using amsoil multi vehicle SS ATF