Has anyone actually had problms running the 10w-30 in the 5.4 motor? I only ask becouse i have 270,000 some odd miles on my 02 Screw with a 5.4 and that is all i have used in the truck after the 200,000 mile mark. I change the oil my self with 5 QT of valv. Full Syt. 1Qt. Lucus, and new oil filter. I have never had a problem, But have seen alot that the 5.4 shuld not use 10w oil. So has anyone actualy seen the 10w oil cause problems? or just going off spects? Also i ran 10w30 in my 02 Mustang with the 4.6, and my 04 mustang gt with the 4.6, also in my 97 f150 with the 4.6, and in my 02 f150 with the 4.2. Am i just lucky? And i bet the crap out of both of the mustangs.

 

Ford calls for 5W-20. My 98 has 321K miles, I use 5W-20 and burn less than 3/4 a quart per 5,000 miles

 

I thought it didn't matter

 

You should be fine. I have ran it in mine before. Personally I don't think It liked it. Could have been just me though.

 

I use 10w30 in my 4.6, I don't add lucas though.

 

Don't tell them that. This threads for those who dump any old thing in the crank case. Then Iduno, -brag about it.

Hell, the correct oil and changing it when you should is cheaper to begin with. Never the less, your always going to have those Joes who outsmart the engineers and defy all odds.

Durr ...

 

I usually add a little water to my 10w30 to thin it just a tad. My engine goes nom-nom-nom when I do that.

 

But it keeps running don't it. They can take quite a bit of abuse. Could call it resilient. The modulars have no problem hitting 1/2 million miles, and then some. As long as you keep up on the maintenance and follow that little owners manual in the glove box. Ford made it easy, - gave yuh the part #'s as well. What you use along the way can make a difference to when the end will inevitably be.

Go ahead and run that slow death oil for no reason, IF it gives you a tickle, - I don't care. You'll run that engine in the ground, then broom it anyway. Make it someone else problem.

I made my point lol.

BTW, - add a little petrol with oil, -vs just water. It has a little more flavor, with sort of a kick.

 

If you want something heavier for whatever reason, use 5w30, and don't put any Lucas in it, that will just make it thicker.

 

I am guessing your just joking, however I have heard of people adding Kerosene into their oil. Im not sure what the advantage or reasoning was but this made me think of that.

 

I hear a little kerosene in the oil helps clean the engine. That's what they did back in the day I have been told

 

As for the question at hand. I had a friend who had been and still is an ASE Certified Master Technician who suggested I run straight 40w after I hit 200,000 miles. He explained that after the years of wear and tear on the internals the higher viscosity oil would help to protect the engines internals and provide a more optimal lubrication. He went on to say that the recommended oil by the manufacturer truly only applied for the expected life of the motor. All vehicle manufacturers have a projected life expectancy for the motors they build. Usually 200k. I chose to go with the advise of a Master Certified Technician with over 35 years of experience.

 

Yea, he's a shiny one lol. Your brother ? Related ? You've been fed.

That's funny lol.

 

I dont see the humor in it. No we are not related. The person I am speaking of was my auto mechanics teacher back in high school. It makes perfect sense to me. The higher the viscosity of the oil the more heat resistance it has. A higher heat resistance leads to less thinning of the oil thus providing a greater protection to those moving parts with over 200,000 miles on them.

 

I can go into a greater and more in depth explanation of the role motor oil plays in an internal combustion engine or perhaps the meaning of the viscosity of oil if you need some help understanding.