First off, I'm new to the site and this is my first post
I've got 3 Quantums, one 1995 4hp, a 2011 675 series, and a 2004 6.5hp
The 675 is hardly used. Factory fill changed at about 4 hours to Mobil Special 30w. It smokes for a second on hot restart if it's sat for a few minutes, but never on...