Ford 6.7 - what oil do you use?
I know the question will elicit various responses, but a post regarding a 2012 Ford 6.7 engine failure on another forum prompted the question. He used 10w30 non-synthetic oil which he stated was chan...
Forum Discussion
Engine oil does other duties beside lube stuff...
Journal bearings for the crank use engine oil (PSI, GPH and the biggie: viscosity)
to keep the crank from going metal to metal...if floats the crank centered
on the block journal bore
The lower viscosity will have the journal oil get squished out by the power stroke
to go metal to metal
Not instant failure, but over time with enough metal to metal contacts...it will fail
Ditto the crank journal to connecting rods. If not enough GPH, PSI and viscosity
It will go metal to metal with no instant failure, but over time it will sooner
Another ditto for most of the other mating surfaces that depend on engine oil
to float it from going metal to metal
The first number is the viscosity 'behavior' of the engine oil at room temp
The second number is the viscosity 'behavior' of the engine oil at max spec temp
Viscosity is the thickness, but is more than just that. One key attribute
within that is film strength
Journal bearings for the crank use engine oil (PSI, GPH and the biggie: viscosity)
to keep the crank from going metal to metal...if floats the crank centered
on the block journal bore
The lower viscosity will have the journal oil get squished out by the power stroke
to go metal to metal
Not instant failure, but over time with enough metal to metal contacts...it will fail
Ditto the crank journal to connecting rods. If not enough GPH, PSI and viscosity
It will go metal to metal with no instant failure, but over time it will sooner
Another ditto for most of the other mating surfaces that depend on engine oil
to float it from going metal to metal
The first number is the viscosity 'behavior' of the engine oil at room temp
The second number is the viscosity 'behavior' of the engine oil at max spec temp
Viscosity is the thickness, but is more than just that. One key attribute
within that is film strength
