Hi...I've just found a dielectric constant measurement instrument at home that I'm planning to use to determine when to make the oil change.
I've done a test to the new oil (Castrol RS 10W-60) that resulted in a dielectric constant of 6, and now, after 1000 km. the dielectric constant is 9. This increment I think is due to the new oil mixing with rests of the old one (different kind), so if after several tests (say between 1000km.) it is still giving 9, then everything should be OK isn't it?
What I'm planning to do is to make oil changes after 10K km. provided that the dielectric constant doesn't increase in a certain percentage, but what percentage should I consider?
PD: sorry about my english