While excellent oil, synthetics are about three times as expensive as conventional oil and not always necessary for most engines. They flow better at low temperatures and maintain peak lubrication at high temperatures. If these oils pass stringent special tests (indicated by their labeling), it means they have superior, longer-lasting performance in all the critical areas, from viscosity index to protection against engine deposits. Full-synthetic Oil: These oils are made for high-tech engines.These three ratings cover just about every light-duty vehicle on the road, though this is changing as engines become more precise and fussy about specific types oil. Car manufacturers usually specify 5W-20 or 5W-30 oil, though some require 10W-30. Most are available in the common viscosities. ![]() Most leading brands have one for SL, or highest level, service.
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