Changing to synthetic, weight reccomendations?

[Jsun3701]

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.

 

[Rickyll7]

use 5w30 mobile 1 and dont use that extended performance crap either, change it every 3k or 3 months, its worth it.

 

[Jsun3701]

You found that a syn 5-30 is better than a Dino. 5-20?

 

[Rickyll7]

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

 

[LaserRed01GT]

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.

 

[streethorse]

5w20 in the winter and 10w30 in the summer.

 

[Dope 97GT]

I run Motorcraft synthetic 10w30 in my car. I also know that the mobil 1 stuff if very good as well.