Hello, new to the site.I have 3 vehicles. My wife's car is a 2003 Impala LS with a 3.8. I use M1 10w30 and mobil1 filter. Car has 130K miles and uses 1 qt./1500 miles. Change between 5-7.5k miles. No oil leaks. This is my only car that uses oil. Any suggestions? 2nd car 2008 Focus w/ 73K miles. M1 5w20 w/ M1 filter. Change at 5K miles. 3rd vehicle 98 Ford E150 w/ 4.6 V8, 130K miles used for towing a 3500 lb. boat. M1 5W30, M1 filters changed yearly or every 3000 miles. No oil burning issues on either Ford. Thanks