Don't worry about it. The only time to worry is if there are freezing
temperatures outside during the early morning cold start. As this will
damage the engine and wear it out faster.
In which case, an engine block & Battery heater is in order.
Tell us more about this pre-oiler. Where does it go? How does it
install? How does it work? How much are they? Who sells them? Can
every car get one installed? What makes them turn on?
<<<<If you're trying to prevent engine wear when starting, a pre-oiler
far more effective than heating the oil or anything else. >>>>
A pre-oiler is a small tank that installs in the engine bay. It
typically holds a quart of oil (which is added in addition to the normal
amount). When the engine is running, oil is pumped into the tank by the
normal oil pressure. When the engine is turned off, a valve closes,
preventing the oil from leaving the tank. When the key is next turned to
the "on" position, the valve opens, releasing the oil into the engine
again and creating oil pressure before the engine is started.
You can find more details and vendors by doing an online search.
Spoken like a man that doesn't know of what he speaks.
A Block Heater does nothing to keep the "oil" warm. A block heater is
placed in the engine to keep the coolant (ie, water + antifreeze) from
freezing in extreme cold climates. It does nothing to the oil. For
that matter, neither does the battery blanket.
In the Alaskan interior, block heaters were a must to keep your engine
block from cracking. Battery blankets were a must to keep the battery
from freezing. The only optional item was the little heater that blew
warm air into the car's interior - and it worked so pitifully that
very few of us used them.
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