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Message: <blockquote data-quote="71buickfreak" data-source="post: 1903565" data-attributes="member: 8373">As dieseltech said, you guys are literally throwing money down the drain. Modern engines do not need the oil changed anywhere near as often as the older engines. Tighter tolerances and better oil mean you can run 7500 or even 10,000 (with a filter change) on a single change. The reasont hat some synthetics leak is because the molecules are smaller and they fit through openings that are too small for conventional oil. I prefer Royal Purple with 2 treatments of Zmax. I have done a lot of research on Zmax, it truly is a microlubricant. It has smaller oblong-shaped molecules, so it fits into the micro pores of the metal. It uses the heat cycle of the engine to draw it into the engine. Every single Nascar team uses it, they actually buy it, and Nascar teams don't buy much.</blockquote>