“How do you actually know the oil is still good?” is a fair question — and you don’t have to take extended intervals on faith. Oil analysis tests your used oil for wear metals, TBN, viscosity, and contamination, giving you real data on your engine’s condition instead of a guess. Here’s how it works and who should consider it.

Diesel engines don’t wear the way gas engines do — soot loading, cold-start behavior, and extended idle time all change the maintenance math. Here’s what DuPage County diesel truck owners should actually know before winter hits, and why a generic passenger-car interval doesn’t map cleanly onto a work truck’s real duty cycle.

Oil changes aren't really about oil — they're about downtime, labor, and how many vehicles are on the road instead of in the bay. Here's why "cost per oil change" is the wrong number for fleet decisions, and what extended drain intervals actually save across a DuPage County fleet's year.

Synthetic oil has been around since the 1970s, but the myths about it are just as old. From "it's just marketing" to "you can't switch back," here are 5 of the most common synthetic oil myths — and what's actually true, according to your local Independent AMSOIL Dealer in Bartlett, IL.