AAA's 59-page report documents a range of industry-standard tests. The agency evaluated synthetic and conventional oil in eight tests that analyzed things like deposit formation, low-temperature performance and oxidation viscosity. AAA found synthetic oil protects critical engine parts 47 percent better on average than regular oil. With superior resistance to deterioration, synthetic oil should benefit newer cars, as well as those with turbocharged engines and anything driven in a lot of stop-and-go traffic, towing conditions or extreme temperatures. |