Quote:
Originally Posted by tjs72lemans
Many of my hot rods I've owned for 40 years with flat tappet cams I've run Valvoline 10-40 and never an issue. My Fiat Spider, I ran Rotella diesel 15-40 oil, as that is what the Fiat guys push. My Pontiac I started with 10-40 Brad Penn and then switched to Driven 10-40, since that is what my engine builder suggested. I asked why the Driven oil stays so clean looking compared to my Valvoline? He said the Valvoline type oils keep contaminants suspended in oil, while Drive oil, the contaminants lay in the bottom of oil pan. I learn new things on oil here and other places I had no idea about. I'm no engineer.
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Detergent oils keep dirt and contaminants suspended in the oil, so that they get drained out of the engine with an oil change. Resulting in a clean, gum-free engine. Non-detergent oils of yesteryear don't, and the dirt and contaminants settle into nooks and crannies and the bottom of the pan. An oil drain leaves them there. Have serviced and worked on many, many engines that ran non-detergent oils back in the day, and they were always a gooey, encrusted mess internally. I seriously doubt that the new Driven oil is non-detergent, but I could be wrong. I would not run ANY non-detergent oil in an any engine I cared about. Brad is right about the by-pass filter, they flat-out work, but most don't want to bother plumbing one into the system for whatever reason.