oil turned gray
I have a 2002 Troy Built self propelled mower with a B&S 6.5HP engine. I change the oil every year and only cut the grass once every week or two. Early this spring (maybe on the first cut of the season?) the RPM's starting getting lower and it ran rough (engine speed would rhythmically cycle up and down), and so it would also die in high/dense grass that would normally be no problem. I also noticed the oil was gray. Just last year it was not at all gray from what I can remember (and ran fine). I've neglected changing the air filter and spark plug for some reason (though I do have several engines to maintain), so the filter was pretty dirty and almost looked a bit saturated with oil(?). I changed it and the spark plug and it runs fine now so far (with one mowing), but after changing the oil, it's still gray. Do I just need to change it again, or is there something else wrong?