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most modern engines do not need much warming up. to the contrary, there is no benefit from prolonged idling and it can actually do more harm to your motor, as the increased time it will take to warm up the engine will increase emissions, causing sludge and varnish to build up in the oil. this will also cause an increase in engine oil acids which will tend to ocorrode engine parts. not a good thing. you were right with your assumption that you should wait until you have sufficient oil pressure and then drive off gently until the oil reaches full op-temp
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