C captainkirkMember This link is from Exxon/Mobil.Synthetic=better science/better performance.This synthetic is installed in many new cars. Most likely a group III synthetic. My preference is group IV syn.http://www.mobiloil.com/usa-en...hetic_oils_faqs.aspx 5/5/106:23 PM Last edited by captainkirk 5/6/101:51 PM