I had been running 5W30 Motorcraft regular oil in my '99 Town Car. With 34,000 miles, it was using a Qt of oil every 1000 miles. The dealer switched to 5W20 Motorcraft Blend and in 3000 miles, it still full. I switched my son '00 ZX-2 from 5W30 to 5W20 Blend a... Login to read more.