As contaminants are whipped into the oil, sludge is formed. This sludge will stick to parts of the engine causing the engine to perform less efficiently. Eventually, this sludge can cause engine failure.
Neglecting oil changes is hazardous to your engine's health, especially if you drive under severe driving conditions, which most people do. Severe conditions include making short trips, driving in stop-and-go traffic, extended idling, driving in dust or dirty air, towing trailers and cold weather driving.
So as you do your spring cleaning, remember your car. And here is a coupon to make it just a little easier on the wallet.