Had a '97 F150 with a 4.6 Romeo engine. By 150,000 miles it was burning a quart of 5W-30 M1 every 800 miles. I switched to Castrol Syntech 5W-40, and it went over 1000 miles before it needed a quart added. Great truck, though underpowered. I sold it with 330,000 miles. Never did have any downsides from running that heavy of an oil through at least 5 midwest winters. I wouldn't get too hung up about too heavy of an oil in a 2V Modular.