This report includes synthetic oils as one of the reasons cars and trucks are living longer, going farther. From Yahoo News: "Back in the 1970s when Pat Goss was working in automotive repair, 100,000 miles was considered the benchmark of a car's longevity. Well-maintained Dodge Darts with more than 300,000 miles were a rarity. Now, with advanced technology, improved engines and synthetic oils, crossing the 100,000-mark on the odometer is not much cause for celebration." "Auto industry officials say it underscores the strides made in engineering and quality control in recent years with a focus on longterm durability. Today's vehicles have more advanced engines, improved spark plugs, higher-performance synthetic oils and better exhaust systems." http://news.yahoo.com/s/ap/20060128/ap_on_bi_ge/a_car_s_life It seems to me that we've had numerous reports of good maintenace with conventional oils providing about equal length car life. Personally, I like synthetic oil in my cars but I realize they are not absolutely required for long engine life. What say you?