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    Short Trip Question

    I live about 5 minutes from work. When I drive to work the water temp gets up to normal operating temperature but the oil only gets up to around 200. Is this bad for the car? Am I causing any damage?

    Re: Short Trip Question

    Welcome!

    I was advised by those at the factory to not take frequent short trips in my new car. Is your "baby" new?

    Pictures please!

    Re: Short Trip Question

    Take the long way...

    Re: Short Trip Question

    You drive 5 minutes to work? Shame on you!

    I live 15 minutes walk from my office (which would be a 5 minute drive) and I always walk to/from my office. Best way to stay healthy!

    Get some exercise!

    Re: Short Trip Question

    agree!
    5 min drive can't be a long walk !
    not good for the car, better for you, simple equation :-)

    Re: Short Trip Question

    Quote:
    easy_rider911 said:
    Best way to stay healthy!





    Maybe the walk also would help the engine to stay healthy
    I'm not a tech expert, but I can't imagine that it's good for the engine if you use the car frequently/daily for such very short trips I'm sure the engine won't fall apart any time soon due to the "abuse", but in the long term it may show some problems, especially if you don't use it often for what it's really made. Reminds me of my old days in Berlin - the cars of West-Berliners (during the cold war period, when West-Berlin has been de facto an island, so that cars almost 100% have been used for city driving only) have been notorious for engine problems/bad performance.

    Re: Short Trip Question

    I commute 3 or 4 miles to work and have the same issue. I try to take it longer some days but still. They say that 10 miles or more is better. There was an article in Excellence Mag this month on oil change intervals and they said that 4 cold starts a day like I do are hard on the oil and increase the need for changes. I put 4000 miles a year on my car and will do oil changes once a year. Short trips are harder on an engine. I would say a couple of times a week drive to or from work at least 10 miles.

    Re: Short Trip Question


    Try one of these, it's possibly faster too, depending on the traffic!

    Re: Short Trip Question

    There is widespread belief that it is bad for the engine. Byproducts of combustion include water. This collects in oil and isn't evaporated until oil gets really hot and stays that way for a long time (i.e. long trips). Water corrodes engine parts. You probably have alot of water in that engine!

    Another thing: until the engine heats up and expands fully at operating temp the bearing and piston clearances (and other clearances) aren't to spec. So the engine is wearing out faster when driven many times "cold."

    You're probably fine, but taking a chance if you keep the car a long time.

    Re: Short Trip Question

    My non P-car has to deal with this (VR6 Corrado) 3 mile trip twice a day, and after 13 years, it's still okay. I did keep it from running short trips while it was new, however. I do change the oil (Mobil 1) every 4-6K miles. It would be advantagous to get the oil over 212 for ~30 minutes at least once a week. That way the water-based contaminants would cook out of the oil.

    Jim

    Re: Short Trip Question

    Quote:
    MMD said:
    There is widespread belief that it is bad for the engine. Byproducts of combustion include water. This collects in oil and isn't evaporated until oil gets really hot and stays that way for a long time (i.e. long trips). Water corrodes engine parts. You probably have alot of water in that engine!

    Another thing: until the engine heats up and expands fully at operating temp the bearing and piston clearances (and other clearances) aren't to spec. So the engine is wearing out faster when driven many times "cold."

    You're probably fine, but taking a chance if you keep the car a long time.



    The water in the oil confuses me. You say that the oil gets hot and the water is released from th oil (evaporates). Does this mean that the air within the engine compartment is regularly changed? If the air is regularly changed then this makes sense, but if the air is not changed, then this makes no sense. Because if the water is released when the oil gets hot, then the water just becomes gas (steam). If the steam is not moved out of the inside of the engine, then the steam will eventually cool and become water droplets (steam condensate) again - settling out wherever they may be within the engine compartment. Can someone explain this process?

    Re: Short Trip Question

    Engine crankcase is ventilated to atmosphere. Up to the 1950's most engines vented directly to the atmosphere. In the 1960's they acquired the pcv valve and are vented into the intake manifold. Today we use a variation of this system. It is necessary to vent the crankcase due to air pressure created by the motion of the crankshaft, piston/ connecting rod assemblies and other internal components. Pressure is also created by compression pressure bypassing the piston rings. Even on new engines you have minute amounts simply due to operation. If you were to "seal" the crankcase pressure buildup would eventually find its way out of every seal, joint and gasket in the assembly.

    Re: Short Trip Question

    Moisture is also a by-product of combustion. A very small amount will bypass the pistons and enter the interior (oiled) engine areas.

    Also note that during normal use of the engine, hot then cold. Air is drawn into the engine (when it cools down) along with it's humidity. This can lead to possible condensation, depending on temperature conditions when the engine is off.

    Re: Short Trip Question

    Quote:
    jplanaux said:
    Can someone explain this process?



    I'm just an amateur guessing, but I rely on the phrase "crankcase ventilation" to explain where the water goes.

    There's also significant pressure created when water is changed to steam (obvious) OR evaporates and becomes vapor(not so obvious). THAT positive pressure in the crankcase would be enough to drive the water out.

    The thing that has me puzzled is supposedly there's acids created too. What happens to them? The only way they are neutralized (AFAIK) is when they react with minerals or metals. I guess you can evaporate acids too... .

    I love questions like this, "Nothing Is Obvious," though I never get to figure them out fully (no time or too lazy).




     
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