oakville
.020 Over
The main "dirt" in dino oil is actually the oil itself. As it breaks down (litterraly) the molecules shred and recombine in much less desirable ways. Synthetic oil is is manufactured so that you dont get the abrasive clumps. You can feel the difference in a finger/thumb friction test of used oil. It will last a lot longer because it is a lot more stable and does not break down as easily. How ever changing it more often will not hurt the engine one bit.