Bought a used 2018 RS1 about a month ago. Have only put about a mile on it. Today I was stripping off some panels for some work I am about to do and I noticed the coolant reservoir was empty, pulled the rad cap off, it was maybe 2" low in the radiator. So I checked the oil, looked a tad milky, pulled the filter and drained the oil, it is barely, but definitely milky. What are the chances it is a head gasket? It could have been swamped. Also, I started it with the rad cap off, no air bubbles. I got a few gallons of cheap oil and a few oil filters to flush it out tomorrow. But I am pretty unfamiliar with these. Anything in particular to look for? Machine looks new. Obviously some mud inside panels when I remove them, but whoever had it looks like they took care of it. Has about 600 miles total.