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Engine warmup
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<blockquote data-quote="Mouse" data-source="post: 139112" data-attributes="member: 2204"><p>Guys, I search through the web about warming up engine, almost all do not recommend it. Here is two article </p><p></p><p><strong>1) </strong>Let it warm up first? That is against all the advice I've ever</p><p>heard. Wait till you have adequate oil pressure, then baby it (i.e.,</p><p>keep the revs down) until it is warm, but by all means, do NOT delay</p><p> the warming up process by letting the engine idle till warm. If you</p><p>keep the revs down, you are not really loading the engine, and you're</p><p>gas too.</p><p></p><p> I have an "Ask Pennzoil" sheet where someone asked them about cold</p><p>starting. The Pennzoil tech said that, unless the owner's manual</p><p>specificially states otherwise, to start the car, wait a few seconds for</p><p>the oil pressure to come up, and drive off, but not to dog on the car</p><p>until the water temp came up.</p><p></p><p> Being a typically impatient American, that's how I drive anyway, but I</p><p>was gratified to see Pennzoil thought it was OK too.</p><p></p><p></p><p><strong>2)</strong> Yes. Too much idling is bad. Especially if the car is cold</p><p>to start with. The longer it takes the car to warm up above</p><p>the vapor point for the combustion byproducts, the larger</p><p>the amount of particulate formation and growth. This leads</p><p>to sludge, varnish and particulates in your oil. In addition</p><p>to the wear these types of particles cause, you also end up </p><p>needing to change your engine oil more frequently because these</p><p>get you to your oil's particulate threshold faster.</p><p></p><p>The same principle leads to the increased acids in the engine</p><p>oil, except that when acids are not boiled off promptly </p><p>(because you idled your car to warm rather than driving it</p><p>moderately to warm it quicker) you get corrosion of the engine </p><p>metals. </p><p></p><p>In addition to long idles to warm up, you can get the same </p><p>deleterious effects by taking lots of short trips. Since it</p><p>takes time above the byproduct boiling point to boil off</p><p>all the byproducts short trips, say under 8-15 miles, especially</p><p>in stop and go driving leave a lot of gunk behind.</p><p></p><p>If you can get your hands on an engine prewarmer (they should</p><p>be pretty common up there) it is well worth it.</p></blockquote><p></p>
[QUOTE="Mouse, post: 139112, member: 2204"] Guys, I search through the web about warming up engine, almost all do not recommend it. Here is two article [b]1) [/b]Let it warm up first? That is against all the advice I've ever heard. Wait till you have adequate oil pressure, then baby it (i.e., keep the revs down) until it is warm, but by all means, do NOT delay the warming up process by letting the engine idle till warm. If you keep the revs down, you are not really loading the engine, and you're gas too. I have an "Ask Pennzoil" sheet where someone asked them about cold starting. The Pennzoil tech said that, unless the owner's manual specificially states otherwise, to start the car, wait a few seconds for the oil pressure to come up, and drive off, but not to dog on the car until the water temp came up. Being a typically impatient American, that's how I drive anyway, but I was gratified to see Pennzoil thought it was OK too. [b]2)[/b] Yes. Too much idling is bad. Especially if the car is cold to start with. The longer it takes the car to warm up above the vapor point for the combustion byproducts, the larger the amount of particulate formation and growth. This leads to sludge, varnish and particulates in your oil. In addition to the wear these types of particles cause, you also end up needing to change your engine oil more frequently because these get you to your oil's particulate threshold faster. The same principle leads to the increased acids in the engine oil, except that when acids are not boiled off promptly (because you idled your car to warm rather than driving it moderately to warm it quicker) you get corrosion of the engine metals. In addition to long idles to warm up, you can get the same deleterious effects by taking lots of short trips. Since it takes time above the byproduct boiling point to boil off all the byproducts short trips, say under 8-15 miles, especially in stop and go driving leave a lot of gunk behind. If you can get your hands on an engine prewarmer (they should be pretty common up there) it is well worth it. [/QUOTE]
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