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Message: <blockquote data-quote="MustangChris" data-source="post: 645886" data-attributes="member: 10830">i dont know what "too low" would be... or what negative consequences would occure from using an oil with too low of weights.i would think overheating would be the most common danger, but once you get to a higher opperating temp (say on a hot summer day in a traffic jam) that oil is not going to protect you as well as you would like..  thats probably why ford recomends a -W30, as to help protect durring the extreme situations that some of us put up with between 8-9AM and 5-10PM... lol.im not saying duffy is wrong, im jsut saying that i dont know what would happen if the 5W20 wasnt performing well at higher temps.id suggest a 5w30 for a street car (personally.)</blockquote>