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Gene · 12-05-2010, 02:34 PM

One very good reason for not running full synthetic oil in an older engine is that they clean your engine. Now I know that sounds crazy but when they clean an older engine it breaks loose years of metal particles and other particles that your filter cannot trap. And if your running a cellulose(paper) filter it ges even worse, I saw a study that showed that if you run an AC or FRAM or basically any non-synthetic filter you might as well not be running one at all, they cannot trap particles smaller than 20 microns. So I run Valvoline(non-synthetic) and a Mobil 1 synthetic filter.

12-05-2010, 02:34 PM	#9
Gene Registered User Join Date: Aug 2002 Location: Muskogee, Oklahoma Posts: 2,914	Re: Too old for sythentecic oil? One very good reason for not running full synthetic oil in an older engine is that they clean your engine. Now I know that sounds crazy but when they clean an older engine it breaks loose years of metal particles and other particles that your filter cannot trap. And if your running a cellulose(paper) filter it ges even worse, I saw a study that showed that if you run an AC or FRAM or basically any non-synthetic filter you might as well not be running one at all, they cannot trap particles smaller than 20 microns. So I run Valvoline(non-synthetic) and a Mobil 1 synthetic filter.