My two Twin Cams are just a little noisy. I wear earplugs so it really does not bother me. However,I think I am about ready to start using the VR-1 syn in my newer bikes. Sounds like the best bang for the buck especially since I believe in short OCI's here in the Texas heat. No oil coolers on my Twin Cam motors either. Not long ago I bought an 02 Night Train Softail with only 1,000 (one thousand!) actual miles on it. I changed oil and used M1 15W50. I ride it slow and solo,usually for around 30 miles per ride. I was a little surprised to discover that it used almost 1/2 qt. in the ensuing 1,600 miles. Not excessive by any means,especially since it is breaking in,but I still feel this particular oil may not be up to the task to go over 2K oci's in this heat with no oil cooler. I run the same M1 in my Road King and Triumph (shared sump but has factory oil cooler),but recently switched to VR-1 syn in my oil-cooled oilhead Beemer. I suppose I will begin the VR-1 switch over gradually and return my M1 15w50 stash to Wally World. All Hail VR-1-The New Magic Elixir!