I recently picked up a 2002 Mustang GT in great shape with 92,xxx miles on it. 4.6 liter SOHC 16 valve engine coupled with a 5 speed manual. I changed the oil the other day, and put in some of the new Pennzoil Ultra 5w20 with an FL-820s filter. I'm curious what other bitog users run in their 2v 4.6 Ford applications, but mainly the 1999-2004 Mustang GTs. Do you run 20wt or 30wt? What works for you?