You all talk a good talk but where's the (FACTS).All I see is hear say.
I call the local Ford dealer they said I'm ok .
Called my shop they said Ok
E mailed Shell they said ok .
And this is all hear say too no Facts.
Sorry I couldn't get back to you sooner. I had a meeting with attorneys this morning that ran into the late afternoon. Funny thing is, it was about motor oil. We happen to be working with one of the largest oil terminals in the United States for distribution rights for ingredients for our oil additives. Not saying I am an expert but we do sell a whole heck of a lot of oil for very expensive motors, so it pays for us to know a little bit about what we are discussing here.
The engine in the Lincoln MarkVIII is part of Ford's modular family of OverHead Cam Motors. These happen to be interference engines, ie: built to some extremely tight tolerances. Ford recommended the 5W30, and now the 5W20 oils not only for emission purposes, ie: less oil buring in the combustion chamber and going out the exhaust pipe, but also for longevity.
Putting 15W40 into an interference engine is like putting in a shake where water should be. The oil is pumped up through the timing chains which fill out the tensioners, the balance of the oil feeds thru the center of the cams which have extremely tight tolerances. Basically the cams run on the thin layer of oil and that's it.
If any of the oil galleries plug up with the sludge you are using, chances are you are going to shear some timing gears.
And the guy that posted
Timing chain rattle is due to tensioner oil leak down, obviously the thicker oil will take longer to drain back, hence less rattle.
And there is your reason for your reduction in the rattle. The thick crap takes longer to drain out. But you are creating other problems that obviously will take at least some time to manifest.
rotella is GREAT oil. i run it in all my cars now. dont be alarmed when it gets really dark, its supposed to do that.
And this guy is a little misinformed. Ever turn the oil in the drying pan up too high? What happens? Oil turns black. Same in an engine. Oil turning black means it is breaking down. It has reached its 'shear' point. The oil is basically crap at that point. Not a good thing. Half the oils sold nowadays have moly and teflon in them. The moly turns to grit and the teflon turns black.
What does your oil look like when you change it out? Run a magnet thru the oil and see how many filings you collect. Everytime you start that engine cold, it takes that much longer for the oil to get into the cam passages. More wear.
You need the thin oil to flush the passages of debris and dirt. What you are doing with the heavy stuff is a slow death. And if you should happen to plug an oil passage, you will experience a sudden suicide. It will be interesting should you ever decide to pull the valve covers. I bet they will be coated with a black goo. I recently pulled a pair on a long term test we conducted that were clean like they just came out of the factory.
Listen, you might be fine for a while with what you are doing but the motor will defintely not last as long as if you were using the proper weight oil. What are your head temps with the new heavier oil? What are the oil temps? Those numbers will tell you more about what is happening in that motor than anything Shell is going to tell you on the phone.
Not to change the subject, but 94M5 asked about a powerstroke. Why does a 7.3L diesel motor have a 14 qt oil capacity versus a 6 qt capacity in a gas engine and how many rpms do the 2 motors turn? Answering that question will lead you to why you should not be using a 15W40 in this motor.
Just my 2cents worth.
