Yes. The startup period is the time when the engine experiences the most wear. By accelerating it before the oil reaches the top of the engine cylinders -- five or more seconds depending on the vehicle -- you can do a considerable amount of damage and speed up engine wear. Should I rev my engine before shutting it off? No. When you rev the engine you introduce a fresh charge of gasoline and air into the engine. When the motor stops, the gasoline mixture just introduced washes the lubricating oil away from the cylinder walls. When you next start the car, there is no oil protection and the piston rings wear heavily on the cylinder walls. Does it help to let your car warm up in winter before you start driving? During the winter when an engine is cold and the oil is thick, DO NOT rev up the engine immediately after starting it. The best compromise is to wait two or three minutes, then drive slowly for the next five to 10 minutes until the engine reaches the proper operating temperature. This procedure keeps engine revs down and builds up the oil pressure required to allow lubricating oil to move throughout the engine. One of the main purposes of lubricants is to control friction and subsequent wear by putting an oil film between moving metal parts. Critical lubrication areas are the camshaft and connecting rod bearings, the cylinder walls and pistons. It takes a few minutes for the engine temperature to warm the oil to make this lubricating process work properly.
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