The wifey drove home last night & said the engine was quite! Wow, I thought this was great. Don't know how long it will last, but started it this morning about 25@F last night (sits outside) it rattled for maybe 30 seconds then went pretty quite, then after maybe a couple of minutes basically went away completely. The quietest its ever been since we have owned it. NOW WHAT? should I run it for about a 1000 mile on this change & dump it again?. I was running Mobil 0-30 w/1qt of Rislone. Maybe thru the cold winter use the lighter oil, then switch later to the 0-40? (I've got about 300-400 miles on this oil change) Tempted to go with a Valvoline Racing oil & change it about every 3500 miles like I do with everything else I own. If I stay with the light Mobil 1 I'm still only go about 4000 mile (short trips) or stretch it to about 5000 with some hwy. miles. Appreciate all the replys & opinions, Thanks. & Happy Holidays, ( I know I just had a nice Christmas present, if it lasts!)