Smelled oil cooking the other night, plug tube had completely filled, and was overflowing onto the valve cover. Replaced two of the three plug tubes, seals and v/c gasket.
I've seen this with full synthetics a lot. It leaves the inside spotless. A good synthetic blend gets close, only leaving a tin. I've personally opened two engines that used to run cheap oil, were sludged up, switched to synthetic blend, and were nearly spotless with a little tin here and there when I opened them up less than 10k miles later. I'm fond of Valvoline Max Life High Mileage and Motorcraft for their quality and price.
It is no lie that switching a high mileage engine with sludge to full synthetic can cause leaks. It takes the sludge off old seals causing them to seep. I reccomend a good blend to people who ask. It has less chance of leaks with the benifit of eliminating sludge.
I'd be willing to bet you would see results like this with any higher end Dino oil as well.....cleaning has more to do with the detergents than the base oils
BTW Dan....very nice though!
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