We have a 2008 GMC Yukon (5.3L) that has just over 154,000 miles. It does burn a little bit of oil, however, as often as I check the level (sometimes weekly), I hate having to add oil to bring it back up to full. I am thinking about trying Valvoline Synpower with Maxlife or Mobil 1 High Mileage 5W-30 to see if the consumption is reduced or stopped. Which would the forum use and why? Thanks!