I ran my Sand Viper 1100 about 70 miles a few days ago with no problems. Today I washed the vehicle including the engine. After about 30 milutes I started it with no problems but the oil light was on very dim. The engine started to knock and I turned it off immediately. I checked the oil and it was only 1 quart low. I added oil and restarted it 3 more times with the same result. On the 4th try I let it run a few seconds and the knocking went away and the oil light went out. I use Mobil1 oil so the viscosity should always be the same. Does this sound like the beginning of an oil pump problem.