Anyone prefer one over the other? I can usually can get quaker state a little cheaper but I know there are a lot of loyal Maxlife users. Vehicle is a 2011 Silverado with the old 4.3 V6. I have had a little bit of oil seepage off and on and haven't tracked it down quite yet. Truck runs fine and dosen't burn or use any oil between changes. It dosen't leak enough oil to have to add any between changes.