Ford 6.7 with spun connecting rod bearing
Hello to all, I am new to this forum. I own a 2015 F-250 with the 6.7. I was in the process of hooking the truck to my 5th wheel (April 15th) for a spring break trip when the truck started to shutter...
Forum Discussion
StirCrazy wrote:Grit dog wrote:
And why would 5W40 be "recommended" but 15W40 cause engine damage.
But jsu tme talking....
thats a easy one, increased oil flow on start up when the oil is cold. tighter tolerences mean less free oil pooling in the berring as the engine drains down overnight, also makes it harder for the oil to flow through when thick. so basicly 5W40 will flow down to 5 degrees and 15W will flow down to 15 degrees, so even at 15 degrees the 5w will flow better providing a faster film on the berrings resulting in less startup dammage.
Steve
Nope, and the weight numbers do not refer to temperature. The numbers 10W 5W etc represent a certain viscosity at a certain temperature.
And at near 0F, a 15W oil has the same max viscosity as say a 5W oil at about -15F.
I don’t see winter viscosity being an issue until very cold temps. Just like any vehicle.
And fwiw, the only explanation of what the 15W issue is, is can cause deposits to form in the lifters (hyd valve adjusters, lol).
