Wednesday, 1 September 2010

My engine uses oil. I'm always adding oil so why should I ever change it?

You should still change your oil and filter periodically to get rid of contaminants and sludge that build up in the crankcase. Just because your engine uses oil doesn't mean the oil that's in it stays clean. It doesn't. It gunks up just as fast as the oil in an engine that doesn't burn oil. In fact, it probably gunks up faster because of increased blowby due to the worn pistons and rings.

If you never change the oil, sooner or later the filter will plug up. And once that happens, you've lost all protection against dirt and abrasives. Before long, the bearings will become worn and you'll hear the rods knocking. Keep driving and something will eventually let go. End of engine. End of story.

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