Oil filters for cars and trucks have around a 10 micron to 40 micron "nominal" rating at best. The only way to find out the beta rating for each filter is to call the company. They are usually willing to provide that information to you. The best rating I have gotten for a filter so far is for the Fram Triple Guard. Your best bet is to install an aftermarket offline filter on your car. These are readily available for a price ranging from $100 up to $500. Believe me, it is worth the investment.