Mobil 1 0W-20 is a "thick" 20W near the top of the 20W scale. Mobil 1 5W-30 is a "thin" 30W at the lower end of the 30W scale (closer to 20W). There should be a little difference but not much. BTW Mobil 1 0W-30 is actually "thicker" or higher on the scale than Mobil 1 5W-30 so 5W-30 is actually a tad better.
Why are you using 30W oils anyway? You lose HP and MPG with n o difference in protection. Fords spec for 20W oil is very strict. It is great oil. Motorcraft, Castrol, Exxon (the thinest 20w)Pennzoil are all Ford spec oil.
Put some in and you will see and feel the difference. I mostly use Synergyn 0W-20 (have used the rest)and am happy as I know I am getting max HP, MPG and protection.
BTW I live in So Cal and it gets 100 degrees.
You're confusing me. 0W-30 is actually thicker than 5W-30? I thought it was the opposite. Are you saying that some company brands of oil are thicker than others? Example Mobil1 5w-30 might be thicker than Castrol 5W-30?
I'll believe it if that's the case. Pennzoil felt like [censored] in my old car but Murrays oil felt beautiful.
He is saying that
Mobil 1 0w-30 is thicker than
Mobil 1 5w-30 & he is right. I've been nosing through M1 specs. & the 0w is slightly thicker than the 5w. Also, different brand oils can vary in thickness even though they are the same weight.
Why are you using 30W oils anyway? You lose HP and MPG with n o difference in protection. Fords spec for 20W oil is very strict. It is great oil. Motorcraft, Castrol, Exxon (the thinest 20w)Pennzoil are all Ford spec oil.
I started using the 30w right before the 20w M1 came out. Wasn't sure how the 20w's would hold up, especially since I live in TX (100+ temps.) & keep the A/C blasting even when idling in stop/go traffic (gotta keep the youngins' cool
). Didn't know the M1 0w was thicker than the 5w then as well. I may give the M1 0w-20 a try, it's easier to find too.
Thanks for the tip tenderloin (BTW-I've been snooping around Bob's site too, thanks again
)