decided to try this. hoping i get the oil soon approaching first oil change soon. probably going to sound like a dump question but i have never done an oil test on anything before... what exactly does the oil test tell you? also, my main concern with pennzoil is sludge, I've heard rumors from lots of people, mostly older generations from 25 years ago... that pennzoil caused sludge and this or that etc. will an oil test tell you the quality of the oil say after 5-6k when you change it to know if theres any risk of sludge? does anyone know how long this pure plus oil from natural gas has been around?