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Do you need to warm up your car?

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If you can hear the valve-train then the oil isn't doing it's job yet. 🙂

So, if it's 20F out and you start the car up, drive off immediately and you can hear a chattering sound or a slight clanging sound then you should wait a bit.

If it's below 40F I generally let my car idle for about five minutes after it has set overnight. This gives the oil a chance to circulate and cover the entire valve-train and it warms up the cabin. I don't like to put a load (over 1000 RPM) on the engine before this. I've been doing this for years with carbed and fuel-injected cars. I have never had an engine go before 200k and only lost 1 engine my entire life of driving.

Moral of the story - take care of your engine and it will take care of you. 🙂
 
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