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I had tried the MC 5W30 in my f150 with the 4.6 and will never do it again. My mpg dropped significantly. I had been using 10w30 mobil 1 syn. I switched back to the mobil 1 last week and my mpg have gone back up to what i was normally getting. Concensus was blow buy with the thinner oil.

I switched to the mobil 1 in my f150's rear and was told i still needed the modifier additive. Not sure if all those friction modifiers are the the same but if so, fords is like $4.

That knocking on the those cold mornings is called piston slap. Common problem in the modular motors. I had it then was told to switch to 10w30 m1 full syn with the fl820s filter.

i know this isn't a long term update, but mand what a difference. The engine doesnt seem to rev up like it used too. I mean when i give it gas it used to fly up to 5000rpms fast, now it dont. It also just seems more torquey. Mileage is way up too.

Well im wishing i never did switch to that 5w20. Im wondering how much money i would've saved on gas. There is noticeable difference in driveability. It feels torquey Whats the next weight of oil after 10w30?

Well I switched back to mobil 1 10w30 full syn. And I have noticed a huge difference in the way te engine is driving. I also have seen my mileage go up too. Not going through as much gas like before. I'll keep a more long term report. And report back later on.

if i can get my *** out of bed early enough tomorrow i'll get the filter/oil. but it wont be changed till saturday the earliest. I've got the second shift at the pd this week.

Im not the original owner. I've owned it going on 3 years now. From what I can tell it was well maintained. But it was a fleet truck so who knows. I did use the Mobil 1 for nearly 2 1/2 years.

Ok im going to try this auto rx stuff when i get paid this week. How many times should I do it? Its pretty expensive stuff. Also from that long paragraph of really smart oil terminology i kinda got the impression that I should go back to the 10w30? Not trying to sound like a smart *** , but i...

how exactly does this auto-rx stuff work? and how would it help me with my problem?

why 5w30 instead of 10w30? i had used it all winter and never had problems before? what are th advantages?

auto rx cleaning? what is that?

I will check my oil level and see how it is. Someone else had mentioned i might be getting blow buy since its a thinner oil. I switched cause my dumb *** was thinking it might help with mpg. But it hasn't. Since I've done the oil change it has dropped. I have not changed my driving habbits or...

My mpg have dropped significantly in my f150 4.6 when i switched to motorcraft 5w20. I had been using 5w30 M1 for a while with no problems. What could be causing my sudden drop off in mpg with the switch?

well i just picked up 6 quarts of the 5w20 motorcraft from wallie world. Im going to give it a shot. Been using m1 full syn. 10w30 then swtitched to 5w30. Getting a little expensive at 3000mile int.

I thought the 250/350 or anything with the 5.4 and up used the 4r100 which is bigger and has a different pan?

Yea its a f150. Where can I get a pan with the drain plug?

magnefine? Doesn't the f150 with the 4x4 orp package come with a tranny cooler?

Does anyone know if there is a better filter out there for the ford 4r70w tranny? Im going to be doing the fluid change soon and will be changing the filter too. Is there something better?

How do I know if my tranny is mercon V rated or dual rated? I think i'll just stick with the motorcarft atf. Its what came with the truck so why not just keep using it. are there any better tranny filters out there?