15w40 in the 5.4l, no more ticking?!
09-24-2010, 07:01 PM
#11
Senior Member
Thread Starter
Yea I don't know, maybe it's loud liftters, fuel injectors, cam phasers, I'm thinking about letting a dealership listen to it, truck runs great just annoying, I always get 5w20 and motorcraft filters... By the way it's an 08 with 43,000 miles... All I want is a quiet engine!!!! It's mainly loud on the passenger side...
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Jkry2121 (09-01-2017)
09-25-2010, 09:36 AM
#16
Senior Member
Thread Starter
Yea I'm aware of these engines being close tolerances so the thinner the better apparently, and yea diesel oil! That's what I said! It's weird when I heard it actually being better than 5w20! I'll try to find a link, it's a lot of back and fourth but some swear by it and some say no, so far it doesn't sound like a good idea on this forum...
09-27-2010, 09:47 AM
#18
Senior Member
09-27-2010, 10:44 AM
#20
Yes, you need to stick with the recommended oil weights (or as close as possible) due to the oils viscosity vs the close tolerances the engine has.
The reason for this is because the tolerances and viscosity determine oil pressure's and the operational 'gap' created by the oil between bearing surfaces. As another matter of fact, liquids don't compress, where as metals will. Therefore as you use a thicker than recommended oil (15-40 for instance) you will over time cause the tolerances between surfaces to open up, or conditioning the tolerances to the 'new' oil over time. This leads to bigger problems than just bearing tolerances and play, especially when dealing with internal mechanisms that rely on specific hydro pressures to activate (such as phasers or other variable valve timing mechanics on other engines).
It's not just as simple as "change to thicker oil to get rid of the tick", you are creating new and different problems within the engines that won't surface for a long time, but will cause issues!
The reason for this is because the tolerances and viscosity determine oil pressure's and the operational 'gap' created by the oil between bearing surfaces. As another matter of fact, liquids don't compress, where as metals will. Therefore as you use a thicker than recommended oil (15-40 for instance) you will over time cause the tolerances between surfaces to open up, or conditioning the tolerances to the 'new' oil over time. This leads to bigger problems than just bearing tolerances and play, especially when dealing with internal mechanisms that rely on specific hydro pressures to activate (such as phasers or other variable valve timing mechanics on other engines).
It's not just as simple as "change to thicker oil to get rid of the tick", you are creating new and different problems within the engines that won't surface for a long time, but will cause issues!