in the morning i like to warm my engine up for 5 minutes or so. its not to cold only about 40 degress the owners manual says to not warm your engine up for a long period of time. i was woindering if this is hurting my engine and how long is the long period of time the owners manual talks about.
I don't think modern engines really need that much warming up. Just ease it out on the street and take it easy for a while. Don't stomp on it until oil pressure is up. I don't have a gauge for oil pressure and don't stomp on it, but if I have to guess it'll be twice the amount of time that your engine is up to temp. BMW techs that I've talked to said it's not even an issue in SoCal to have to warm up at all. Ease it out for a mile or so then drive as normal. I'm not a mechanic so just consider it an opinion.
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It said in the manual to not leave it idling for longer then 20 minutes.
I think this has to do more with the cooling of the engine. If it is 40 outside, i think that is less of a problem. For 5 minutes, you are fine.
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I use my remote start almost daily here, it is set to run for 25 minutes right now ( may bump it up ). I have not seen any adverse effects from this. The one thing I do though is increase the frequency of my oil/fluid changes. I might not be putting on miles but I am putting on hours.
Instead of 8,000 km between chagnes I bump it to 5,000 km.
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In the newer vehicles warming them up allows some of the combustion gasses (some get through) to stay in the base of the chamber and mix with the oil. Gets pretty crrosive.
That's what i've been told. Anyone corroborate?
I actually believe that it has more to do with the Oil, when the motor heats up the oil breaks down to a lower viscosity so when the motor is at idle the oil is not being pumped to the top of the motor at the same pressure as when it is in higher RPMs. So thus you have less oil getting to the top of the motor and it is harder on the engine parts.
Something I have always done with all my vehicles is I wait until the initial high-engine RPM's at startup slows down to a normal idle, with the FJ usually just a few seconds when it's around 40 degrees. Then, drive it nice and easy until I sense that the engine, transmission, driveline and brakes, etc... have warmed up some.
I love watching people in the parking lot at work who get in their cold car, fire it up and immediatly put it in gear and speed off.
I can't stand my current (and past) Ford vehicles that run at a very high idle for a few minutes before slowing down to a normal idle. Hmmm...
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