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    Re: Setting off from cold.

    Quote:
    John H said:
    Quote:
    Fanch said:
    Quote:
    John H said:
    I've seen many posts on several threads that advocate the following:

    1) Never warm up the engine at idle i.e. start up - move off. (the manual supports this.)

    2) Don't floor it until the oil temp is up to normal.

    3) Don't floor it until the water temp is up to normal.




    Hi John,
    Didn't know about point 1, actually, I always let my car idle a bit before setting off, like a minute of two.
    2 and 3 are indeed critical, I use the oil temp and an indicator and don't drive past 3000 rpm til it's warm enough.



    Still can't find any reference in my UK manual to any recommendations re oil temperature.

    Are there any in manuals from other countries?

    If the oil temperature is so critical why is this the first P-car to have a gauge that measures it?

    Interpretations on this thread seem somewhat varied.



    Bottom line is that oil temps are critical. It doesn't matter if there are disparities in various manuals; facts are facts. The data which supports this claim is virturally limitless. I would suggest seeking advice from unbiased professionals such as racing engine builders, race team mechanics; the counltless mag. articles regarding the importance of the issue, common sense, etc... We could discuss forever as to why Porsche hasn't included temp. gauges before, but that doesn't change the facts. Your engine probably won't fail if you don't warm your oil, however, it most-likey will somewhat shorten it's life and not perform as well as another that is treated properly. If that's not important, let her rip when the oil's cold.

    Re: Setting off from cold.

    Seems that nobody really knows whats going on.
    The reason why we are told to drive off immediately is that warming up the engine while standing still can ruin the catalytic converters. I cannot remember the technical reason but it is fact that this is the reason.

    Nevertheless the most important for engine and transmission longevity is that you wait till the oil is at operating temperature. The purpose of water is cooling the engine so you don't have to wait for that to heat up.

    Oil however lubricates the engine. And that's the most important thing for engines. Not enough lubrication and you damage cylinders, piston, rings etc.

    Oil needs to be at operating temprature to reach its full viscosity. Only then it lubricates as it shoul. Flloring it with cold oil can also damage the oil pickup and pump as it is harder to pump cold non viscous oil.

    Re: Setting off from cold.

    John H, I can remember reading the same thing i.e. don't let rip until the oil is at 90 Celsius.

    Funny story: in Dubai (where the temperature each Summer can reach 55C), it's so damn hot that the local people often start their cars and let them run for about 20-30 minutes while they're getting ready to go out so that the airconditioning has enough time to cool the car!! Crazy huh? It's a mad, mad world.

    Now how does that square with all the right technical advice on this thread?? I don't think so!

    In fact, a friend of mine went to a shopping mall while he was in Kuwait. It was 53C in the shade!! The car park was full of S Class Mercs all with the keys in the ignition and the engines still running so that the airconditioners could keep running. Funny thing is, the cars were all unattended!!! Absolutely unbelievable. Women obviously treat their comfort while shopping as being much more important than the risk of their cars getting stolen and driven across the border to Iraq, Saudi Arabia etc etc

    I guess this is only to be expected when cars are cheap because there's no sales tax, petrol is cheaper than water and everyone changes their car every 6-12 months anyway because they wouldn't be seen dead in anything other than the latest and flashiest German cars...

    Re: Setting off from cold.

    Quote:
    intouch1 said:
    Seems that nobody really knows whats going on.
    The reason why we are told to drive off immediately is that warming up the engine while standing still can ruin the catalytic converters. I cannot remember the technical reason but it is fact that this is the reason.

    Nevertheless the most important for engine and transmission longevity is that you wait till the oil is at operating temperature. The purpose of water is cooling the engine so you don't have to wait for that to heat up.

    Oil however lubricates the engine. And that's the most important thing for engines. Not enough lubrication and you damage cylinders, piston, rings etc.

    Oil needs to be at operating temprature to reach its full viscosity. Only then it lubricates as it shoul. Flloring it with cold oil can also damage the oil pickup and pump as it is harder to pump cold non viscous oil.



    No kidding; nothing like what I said in any of my previous posts . The only thing I was unsure about was the drive off immediately, and thus disclosed that fact. How many times did I stress the importance of warming the oil, tranny and diff. and the likelyhood of detrimental consequences if it were not done; several in the aforementioned posts. But, hey you're right, I don't know what I'm talking about. Glad you cleared that up.

    Re: Setting off from cold.

    Quote:
    devo said:
    Quote:
    intouch1 said:
    Seems that nobody really knows whats going on.
    The reason why we are told to drive off immediately is that warming up the engine while standing still can ruin the catalytic converters. I cannot remember the technical reason but it is fact that this is the reason.

    Nevertheless the most important for engine and transmission longevity is that you wait till the oil is at operating temperature. The purpose of water is cooling the engine so you don't have to wait for that to heat up.

    Oil however lubricates the engine. And that's the most important thing for engines. Not enough lubrication and you damage cylinders, piston, rings etc.

    Oil needs to be at operating temprature to reach its full viscosity. Only then it lubricates as it shoul. Flloring it with cold oil can also damage the oil pickup and pump as it is harder to pump cold non viscous oil.



    No kidding; nothing like what I said in any of my previous posts . The only thing I was unsure about was the drive off immediately, and thus disclosed that fact. How many times did I stress the importance of warming the oil, tranny and diff. and the likelyhood of detrimental consequences if it were not done; several in the aforementioned posts. But, hey you're right, I don't know what I'm talking about. Glad you cleared that up.



    The reason that it can damage the converters is because the excess fuel can not be burned off as easily due to the converters not being hot enough yet .

    Re: Setting off from cold.

    One other thing to think about is oil pressure - when the engine oil is cold it is "thicker" and when I used to race cars( many years ago!) we always used to get the engine oil hot before using high revs to avoid blowing oil seals.

    It may not be relevant but thinking about the RMS problem - I always avoid using over 3ooorpm before oil is fully hot and has "thinned out"

    Re: Setting off from cold.

    Quote:
    intouch1 said:
    ...as it is harder to pump cold non viscous oil.



    non viscous would be solid... as oil gets warmer, its viscosity lowers.

    Re: Setting off from cold.

    Engine oil has changed dramatically over the years.

    But it's a good point and I'm wondering whether using different types/grades of oil makes a difference to the apparent necessity for bringing it up to temperature.
    .

    I use Mobil 1 0W-40 fully synthetic.

     
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