which one ????

mer

Messages
30
Location
ILL
I am a M1 user, what wght. oil 5w20 or ow30 is better for cold weather use in my 2003 ford f-150 5.4 ????
 
Messages
5,163
Location
Great White North.. eh
the 5w20 is thinner at all temps, and will therefore flow better (better being relative) in cold temps. If your manual calls for a 20 weight and you want the best cold weather performance, then use the 20 weight.
 
Messages
6,917
Location
NH
I believe the engine is spec'd for 5W-20 so stay with a 20 weight. If you want to run a 0W during the dead of winter run 0W-20.
 
Messages
14,776
Location
Illinois
Like you I live in Illinois and I use M1 50-30 EP in my 07 Focus, And either M1 5-30 or 10-30 in my Merc. Grand Marq. Both work well.
 
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