Thread: Oil
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Old 09-24-2017, 06:36 AM   #25
FF
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"There is a downside to heavy weight oils - It takes longer for the oil to flow on startup and in cold weather."

I am not so sure of this as oil in most engines is pumped with a geared pump , the days of a finger bolted to the end of a con rod for splash lubrication are gone..

In coaches and large trucks the thin winter oil is used instead of a block heater so the engine can spin rapidly enough for compression temperatures to get high enough to ignite the fuel.

Thin oil is considered safer than using an alternate fuel, Ether, as it is too common for a driver to attempt to start a warm run out of fuel vehicle with the Ether. This can cost the engine.

"Modern " oil usually just means more detergent , as since '96 many engines are fed their exhaust gasses for the air police , which is hard on the engines.

Single weight oil has less modifiers and additives so there is more oil , in the "oil".
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