what brand motor oil/filter are you using?
even better: in my area Rotella is far cheaper than Mobil 1 as is the Wix filter. i do an entire oil change for about $25 or so. can't beat that. and plenty of zinc and phosphorus to go around (for my build, anyway).

Rotella-T 15W40, and Mitsubishi OEM oil filters, every 2,000 miles. Everything I own uses Rotella-T, except the streetbike, which uses Repsol.
Also, why do you change oil so often (I'm asking everyone, out of curiosity)?.
I change every three thousand because that is when the oil gets dark and stinky. That's my lab test. Also, I have several cars so no one of them gets that many miles and I like to run a higher viscosity oil in the summer.
Penrite hpr10 10w-50 full synthetic and k&n oil filter. Change every 5000kms. Mitsubishi evo 5 with 220ks on the clock.
Usually a dash of promar mbl8 if the lifters are a bit ticky. Once every 2 changes on average
Usually a dash of promar mbl8 if the lifters are a bit ticky. Once every 2 changes on average










