The Oil Filter: A $25 Part That Protects a $10,000 Engine

Here's a mistake we see constantly: people, or budget servos, change the oil but leave the old filter in. It feels like a saving. It isn't.

Every drop of oil in your engine passes through that filter, over and over again. Its job is to catch the junk — metal particles, carbon and grit — before that abrasive material gets pumped back through your engine's bearings and moving parts. A fresh filter does this cleanly. An old, clogged filter can't.

Reuse a used filter and two things go wrong. First, it's already partly blocked with whatever it caught last time, so it filters less effectively from the moment you start the car. Second, when it eventually clogs completely, a bypass valve opens — and now unfiltered, gritty oil flows straight through your engine to avoid starving it of oil entirely. That's the exact situation the filter exists to prevent. So you can end up with brand-new, clean oil being dirtied immediately, and in the worst case, abrasive particles circulating freely through the most expensive part of your car.

The maths is stupidly simple. The filter is one of the cheapest parts on the vehicle. The engine is one of the most expensive. Skipping a filter to save the price of a couple of coffees, while risking the engine, makes no sense at all.

Change the filter every single oil change. No exceptions. That's how it's done properly — fresh oil, fresh filter, every time — and it's included as standard when we do yours.

Need a hand? Call Mehdi on 0424 334 080 — mobile mechanic across Western Sydney.