01-25-2016, 05:41 PM | #1 |
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Didn't know...hurting your engine by 'warming up' the car
Interesting read I found on MSN: Stop hurting your engine by 'warming up' the car when it's cold out http://a.msn.com/08/en-us/BBowQ2l?ocid=se. I thought in these extreme cold temperatures I was doing a good thing. I guess not!
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01-25-2016, 08:10 PM | #2 |
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As the car manual states, drive immediately but keep the rpm's low until fully warm.
Thats what I have been doing for the past 5 to 6 years on all my BMW's.
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01-25-2016, 08:27 PM | #3 |
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LOL, I should read the manual The good thing is my wife and kids never warm up their BMW's...They figure it's in the garage so it's warm enough plus they don't believe in wasting gas well not theirs anyway. My Jeep GC sits out and I sure do love the remote start that has those seats and steering wheel toasty before getting in and having the A/C & cooling seats come on in the summer is fantastic. I think the X5 in Europe has a good solution to a remote start. Anyway, I found the article interesting and obviously had no idea...poor friggin Jeep.
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01-26-2016, 03:01 AM | #4 |
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Exactly as I was taught in Germany in 1981. Turn on, maximum wait 15-30 seconds, drive keeping the rpm low until warmed up.
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01-26-2016, 11:10 AM | #6 |
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Best for the engine, though in severe subzero temps it's hard on belts et al plastic & rubber things that are strained in severe cold. That said, after the initial engine rev, I don't let mine warm up either (50i).
Knew a guy that lived in Germany for a few years (military). He said the first morning he had to drive to work he let his 525 warm up for 5 or so minutes and his neighbor called the police on him. Jerk move, but apparently it was illegal to do so?...hadn't heard that before, but would make sense. |
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01-26-2016, 01:29 PM | #7 | ||
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01-26-2016, 04:24 PM | #9 | |
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It is not hurting the engine leaving it running if you run in to the shop (if it is warm) it is however bad for the environment... Why it is bad for the engine leaving it in idle after a cold start is because the piston-rings sort of "glaze" the cylinder walls making the seal/gap between the two becoming worst than it should. This will lead to slightly worst compression and increase the risk of oil seeping through. Regards, Niclas |
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01-26-2016, 06:09 PM | #10 |
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This is the main reason why I wouldn't want to put a remote start like most people do to "pre-heat" their car in the winter.
Interesting thing I learned from that article tho: "In fact, your car will be at least 12% less efficient at burning fuel when it's cold, according to the Environmental Protection Agency and the Energy Department." Maybe that explains why my MPG has gone down in the past couple months. |
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01-26-2016, 09:25 PM | #11 | |
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Diesel is different. The way you make a diesel go faster is simply add fuel. Since diesels have much higher compression ratios (our 35d are 18:1 where the 35i is something like 10:1) and no spark plug, and the diesel fuel can burn at a lower temp, you won't get cylinder washing by too much fuel. In addition, diesel air fuel ratios can be as low as 3:1 or as high as 50:1. This is why diesels trucks let their engines run all night in extreme cold weather (fast idle around 1000 rpm) because the AF ratio is right where it needs to be to idle - maybe 5:1. There is no possibility of cylinder washing because all the fuel is burned. If you want to make monster power, add a couple of turbos, and stuff as much air and fuel in the cylinder as the head studs will take. Anyway, follow the manual's instructions. Start it, let the oil circulate for a moment, then drive away easily. In extreme cold, I make sure my SL550 is in a garage as the power steering fluid and suspension fluid needs to circulate at the lowest pressure possible so they don't blow a seal/hose/fitting. I know this from first hand experience when the ABC suspension system blew a hose on start up when in the 20F range. That cost $1500 to replace the line. My Porsche would spike oil pressure at 100+ psi on a cold morning which could damage seals, rubber lines, o-rings and oil coolers. This is why it is a good idea to use a good quality oil and the lowest viscosity the manual allows. 0W20 is good right now and summer maybe 5w40. Your motor will reward you with long life.
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01-26-2016, 09:34 PM | #12 | |
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01-27-2016, 04:57 AM | #13 |
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If you have a heated garage, you may wish to keep it just above freezing.
When you drive with a really cold car in a too warm garage, dew may form on all car surfaces and if it happens often, internal less protected sheet metal and other parts (connectors, etc.) may rust. Learned the hard way... |
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01-27-2016, 05:53 AM | #14 |
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What does the owners manual say on the diesel cars?
This is what it says on a gas version on page 197: Drive away immediately Do not wait for the engine to warm-up while the vehicle remains stationary. Start driving right away, but at moderate engine speeds. This is the fastest way for the cold engine to reach its operating temperature. The only difference for diesels would be the starting process in cold conditions as follows. Diesel engine If the engine is cold and temperatures are be‐ low approx. 32 °F/0 °C, the start process may be delayed somewhat due to automatic pre‐ heating. A Check Control message is displayed.
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01-27-2016, 12:26 PM | #15 | |
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01-27-2016, 01:02 PM | #16 | |
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01-27-2016, 02:28 PM | #17 |
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I know about the glow plug and that it takes a little longer to start on a diesel during very cold weather... My question was what does the owners manual say for a diesel model as far as drive away immediately or not... If it says drive away immediately just like the gas version then what 42pilot said above is contradicting.
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01-27-2016, 03:16 PM | #18 | |
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01-27-2016, 03:21 PM | #19 |
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We are talking about (in this thread) how bad it is for our cars to start and idle for the engine to warm up. You mentioned above that the diesel and petrol are completely different in this regard... perhaps I'm not fully understanding what you were responding to.
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01-27-2016, 04:18 PM | #20 |
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Fair enough. Petrol or gas cars should not be idled for an extended time after start in very cold weather as they start in a rich condition. This will wash the cylinder walls causing excessive wear and the excess gas will dilute your engine's oil.
Diesels can be started in very cold weather (with the help of glow plugs) and left to idle without the risk of cylinder washing because they do not start fuel rich like gas motors. Once either (or both) are started and the engine has settled (within a minute-ish - circulate oil and (gas motors) idle lowers), drive away.
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01-27-2016, 05:43 PM | #21 |
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Before the end of junior year, I am going to apply to U42P (University of 42pilot).
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01-28-2016, 08:05 AM | #22 | |
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I am also using the best oil available to help minimize cold start wear. (Amsoil European Formula) Alan
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