Changing to synthetic, weight reccomendations?

Jsun3701

New Member
Dec 10, 2004
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Virginia
Im changing my oil to synthetic before I drive to Philly this weekend, reccomendations on what weight I should use? Yes Im using the Mobil 1 filter. Also throwing in some Lucas. Not looking to start a long thread, just asking if you have made the switch, what witch weight gave you the best results.:hail2:
 
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5w20 MIGHT gain you 2-3 rwhp an .7 mpg. but I will not run it. ford made the change to the 5w20 for the mpg gain, however, they have not changed their engine tolerances to compensate for this. i would stick with the 5w30. but its up to you. im sure in the short run, it wont matter, but 100k miles from now, who knows:shrug:
 
I use Mobil 1 5w20 full synthetic and a Motorcraft filter. The Motorcraft filter is much better at appropriately controling drain back on these motors.

There is nothing wrong with running the 5w20 in regards to oil/bearing clearances. The oil/bearing clearances on these factory motors are plenty tight.