My truck calls for 5w30 that is what i have been using it is a 99 F 150 4x4 5.4 i thought i about 10w30 MC?

 

What does your manual say? Why would someone here know more about the kind of oil to use than the people who designed your truck? Just something to think about--not trying to attack you or anything.

 

I think that is what your owners manual calls for, 5-30 MC

 

Owner's manual calls for 5-30, or in some cases 10-30 if the temps will be above zero degrees. 5-30 is good across the board though.

-Joe

 

i went to 10w30 just cause im nearing 150K miles it seems to run better and oil is lasting longer and i dont get anymore blow by

 

I am running MC 5w30 w/a MC filter in my 97 F150 4.6 and I have a little over 198,400 on my truck.

 

 

No......

 

Oh brother. Does John Deere mark up their oil and filters 200% like everything else they sell? I don't have anything against Deere, except for their unreasonably high prices. I don't think their products are any better than anything else.

 

Nevermind 10w-30, many say going to 5w-20 from 5w-30 is best because it gets into the heads better would be the way to go. Everyone has their own rationale behind oil and preferences as to brands and weights and blends. Again, as long as it's maintained proper, there is nothing more you can do. Going to 10w-30 is OK, but keep in mind that oiling to the heads requires thinner oil to be ideal. My uncles 99 merc gets 10w-30, why? don't know but it was fine, I then changed to 5w-30 and she never missed a step. Just my spare change ($0.02) on this subject.

 

I use Castrol GTX 20/50 here in Ca. . You guys all might freak out on that one... Change it every 2500 miles,

 

holy cow that is thick! That is what my quad takes and it has the engine and tranny together.

 

I know how you feel!

But, actually no. The oil filters are the cheapest I have ever found. And the engine oil is only a little bit more expensive than napa. But my truck doesn't burn it as bad as it did the napa. It doesn't seem to lose its viscosity as fast as the napa stuff, or motorcraft, and that's why I run it. It comes out just as thick as when it went in.

As for whether or not their oil is better.... I don't know for sure. They REALLY tout it, and the machines do tell a difference. (as far as using oil) JD also allows you to extend the regular oil change interval from 100 hours to 350 hours just by running it. Obviously this might be a marketing technique, but it REALLY isn't that expensive, I think it's just over $2 a quart... And 350 hours is an eternity for a dirt eating WOT running diesel engine.

It may not be the best, but it's good oil. My dad saves some of the used oil out of the tractors and pours it into all the little 5 hp engines we have around the farm! I took a pic of that a while back, and I was just saving it for the right moment. I was hoping it would be in an Amsoil or Mobile1 thread but......

 

Ford has recommended all F150 gas engines from 97' to present to use 5W-20. Even if your manual say 5W-30, Ford has issued a maintenance bulletin that supersedes that recommending a change to 5W-20.

Don't start saying it's because of fuel economy CAFE numbers, because that only applies to current vehicles for sale. Ford wouldn't risk reliability issues on older engines, so there has to be a reason for Ford recommending 5W-20 for old engines right?

After speaking with both a Ford engine tech and an independent Ford mechanic, it seems that the 5W-20 lubricates the upper-valve train better than 5W-30.

These modular engines are tighter in tolerances, and the 5W-20 works really well in them. Hence Ford recommending all modular gas F150 engines from 1997 to present to use 5W-20.

 

I used 10W-30 because that is what was laying around the shop the last time I changed fluids. To me the engine was more quiet than with the 5W. Just my $.02