Quote:
Originally Posted by Jack Gifford
Can you imagine what it was like prior to multi-viscosity oil? That's the main reason Pontiac initially used reverse-flow cooling in their V8- to allow transfer of heat from the cylinder heads to the cold bottom end.
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Also why 0W-6, 0W-10 and 20 are pretty much standard issue now on modern gas engines. The tiny orifices oil has to travel through for chain tensioners, variable valve timing features and cylinder de-activation systems would never work in cold climate conditions. Running one of these new engines with 10W-30 oil or heavier will almost guarantee a check engine light and dozens of trouble codes. Most of those internal passages are .007"-.015" diameter.