I bought a used 2007 Malibu with the 2.2 ecotec motor and it has 28,000 miles. Will be used by my daughter who is attending college 100 miles from home. I will not have a chance to check it every week; rely on her to check fluids, but I have taught her how to check oil and how to change oil. The oil life monitor shows about 60% useful life. I am thinking conventional Pennzoil, Valvoline or Havoline 5w-30. I have never owned a 4 banger before and would appreciate any advice/recommendations.