How important is this spec? What is it exactly? What is a Low-SAPS oil? I only have 2 choices for this in my area, and both are hard to come by. I can choose from Mobil1 0w-40 European, or Castrol Edge w/ Syntec 0w-30. Even those I have to buy in cases of 12 because I am the only one in town that uses it so no one will stock it. Will a regular 5w-30 synthetic work? I don't listen to the OLM in my car exactly, I usually change it halfway through where it tells me to.