my coolant level stays pretty solid, as does my oil. maybe i ought to test these numbers again to make sure, try synthetic and see if it does anything. i guess it's worth a shot. next oil change i'll do an analysis as well. don't want to turn this into an oil debate thread, but do you recommend rotella just because its cheaper or you think it's better? i read lots of recommendations for mobil delvac 1 for cleaning things out.

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1980 300D, 128K