I hear those that are against using 5w30 state that newer Fords have tighter clearances. But then they never advise what the old/new clearance difference are. I do not know much of clearances but would be most interesting to find out.
(1.) Is it verifiable that ford clearances have changed/tightened ( in particular ford 5.0 2015+ ).
(2.) Is thinner oil 5w20 required for tighter clearances so the oil can get in between better and pump up a better hydrodynamic wedge?
I still suspect its all mostly just for CAFE but would like to hear from anyone with engine building experience/knowledge of the specs on the items above.
regards,
(1.) Is it verifiable that ford clearances have changed/tightened ( in particular ford 5.0 2015+ ).
(2.) Is thinner oil 5w20 required for tighter clearances so the oil can get in between better and pump up a better hydrodynamic wedge?
I still suspect its all mostly just for CAFE but would like to hear from anyone with engine building experience/knowledge of the specs on the items above.
regards,
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