For those of us Autopians that live in (very) cold climates and have their cars sit out overnight when it -20°F, synthetic oils are a wise choice for cold starts. Is it worth it cost wise when compared to conventional oils? I do believe that cars start easier and faster and overall, it`s easier on the starter and there is less of the clack-clack-clack of the valve train for that first 5 seconds or so until the oil is pumped to them.
The one drawback that may happen to cars that use synthetic oils and sit for long periods of time (like warm-weather-only garage queens) is that the oil is so superior in terms of viscosity (the measure of pourability based on its "thickness") that it may run off cylinder walls when sitting for long periods of time. This is why it may be necessary to start vehicles sitting in storage or non-use on a monthly basis and let them warm up. The other option is to remove the distributor wire and cold-crank the engine over and let the oil pump through the engine for about 5-10 seconds to prime the oil system if the vehicle has been sitting for an extended period of time.
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