Quote:
Originally Posted by sclitheroe
I think this could be incorrect information. The way it was explained to me, very old cars had gaskets that swelled slightly in the presence of conventional oil, which is what kept them tight and leak free. The synthetics did not cause this style of gasket to swell, hence engines that leaked oil.
This is not, apparently, the case with any car made in the last 10-15 years.
For your 15,000km oil change intervals, how are you assessing that its time to change the oil? Not based on colour alone I hope.
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I don't buy the gasket swelling thing, gaskets have been made out of many materials including cork, rubber ect. Its also proven that synthetic is a better penetrant than conventional. My truck has an oil life monitor that I change at 20% life remaining. Usually this is around 15,000km. I can't use color to determine the life since diesel oil is charcoal black as soon as you fill it.