Haha, love waking the neighbors. My neighbor behind us has a 350 in his Tempest that was rebuilt a couple years ago, and I don't think he has anything special for exhaust either; and I can usually hear him start it up in the garage. I think ours is fairly loud (it does have some old cherry bombs), but not bad. Never had any complaints anyway.
Yeah, I'm back to 10W30. The first time I drove it to work this year (30 miles highway) I ran it really low on the way home. Found out I was about 3 quarts low. Still don't know how it happened. I can't recall if I checked it before then, but I check it pretty regular and haven't had a problem before. So I wondered if I had a blowout of oil somehow (it still had the 20-50 oil). I changed back to 30 weight, and so far so good.
And yes, the cowl tag is pretty much directly over the master cylinder.
2003 Black SLE-Stock
2000 Mercury Mountaineer
1968 Oldsmobile Cutlass Convertible-455 cubic inches of muscle