Originally Posted by ZeeOSix
Originally Posted by painfx
I would think opposite because oil flows better if it is not cold. What is MOFT?
If mechanisms that are dependant on oil viscosity/thickness and are fed by a positive displacement (PD) oil pump, then they are still getting the same oil volume (PD pump). But with thicker cold oil those mechanisms (chain tensioners, hydraulic lash adjusters, etc) may react better. Oil pressure at cold start-up will be a bit higher also with thicker oil.
MOFT = minimum oil film thickness.
Originally Posted by Mad_Hatter
My guess is the the thickness of the oil film at startup is going to be greater in the winter than the summer. The valve train has many parts operating in boundary area lubrication so a thicker oil film, leftover oil from the previous running, at startup would seem to make things quieter as opposed to a thinner oil film at startup in the warmer summer months. (oil film thickness collapses as temperature rises)
Anywho..not sure I stated it properly or I'm entirely accurate here but I *think* I am, but/so feel free to "check my work" as they say.....
In that case in the summer, if I go with Mobil 1 EP 0w-20, I will not have valvetrain noise like the cold season? Not sure if it is worth the switch? Vehicle does not have oil consumption problem and great fuel economy.