“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.

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.