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Originally Posted by E-MACH
I use Motorcraft 5w20 for a variety of reasons: It has synthetic in it, it gives Ford no wiggle room if the engine fails, it only costs $2.39 a quart. I believe timely oil changes are far better insurance for your motor than the high priced uber-oils. My 2¢. Have a great weekend.
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Ford will have no wiggle room with any brand of oil provided that you use the correct weight...5w20.
A simple rule that I tell my friends is to decide how long they are going to keep the car and how you are going to use it. If you are going to put 150k + miles on the car then you should go ahead and use a good synthetic oil changed at normal intervals. Pure synthetics run cooler and provide better lubricating properties which result in more power and less wear. If you don't plan on keeping it that long, put regular oil in it and let the next guy worry about rebuilding the engine.