Originally Posted by Diamnd1

Well, since I have switched oil weight to 5w30, the startup knock is about 1-2 secs vs 3-5 secs. I have not put enough miles on it to gauge oil consumption, which was about 1/2 qt per 3k miles, not bad anyway. I bought Seafoam last night to clean the fuel and intake system and will do that today. Hopefully will help in the 'ping' dept. Yeah, I did the Techron when towing too. ONCE! Not advised!!

I will have to check the under hood sticker on mine to see what weight oil is on it. My manual and the oil cap have 5w20. I have always thought that is a awfully thin oil to use on a large working engine. I just attributed to smaller oil passages in the internal components needed the thinner oil to move through.

Originally Posted by dkf

First you heard of it because it makes no sense. A thinner oil will get past the rings quicker than a thicker oil like w30. Not that it makes much difference when the oil is at 200+ degrees anyway. Ford is recommending 5w30 in more engines now than they did ten years ago. Besides I bet money as much or more oil gets ran through the engine from the PCV system putting it back in the intake than gets past the rings. Don't run Techron in the truck if you are pulling much of any weight, it will make detonation worse while running it.(don't ask me how I know)

Originally Posted by jyro

I was old school once too, that's the way it is, like it or not. Ford upgraded recommendations for ALL v10's to 5W20.

Originally Posted by Diamnd1

I did the Seafoam treatment last night to the intake system. I will admit I was very skeptical and did not expect it to cure, or at best, minimize the 'ping'. Well, I am glad to say that the ping is gone! I believe that I will perform this treatment every 2nd oil change to help prevent future 'pinging' related to the oil and carbon buildup.

BTW.. I do not have a sticker in the engine bay that states what weight oil to use.