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cold run v warm up
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Author:  aspen76 [ Wed Oct 31, 2012 4:36 am ]
Post subject:  cold run v warm up
Ok, so I've been thinking (terrible idea right?), do I use more gas by letting my slant warm up in morning or just driving it? I know that a cold engine uses more gas than when it's in operating temperatures but idling for 5+ minutes uses gas too. Should I let my car warm all the way to normal operating temperatures? Should I let my car warm up for 30 second to a minute? (let the oil flow and go) or Should I just get in and drive? My drive every morning is a short one, 15 minutes tops (and that if I'm sitting at a red light).

Thanks,
Aspen76
Author:  SlantSixDan [ Wed Oct 31, 2012 10:21 am ]
Post subject: 
Choose your oil correctly for the ambient temperatures and the amount of wear your engine has; don't use too heavy a weight of oil "just to be safe" because you'll be making things worse, not better. Do not "warm up" the car by letting it idle for minutes on end before driving it. That murders fuel economy and greatly aggravates engine wear. See to it the car is tuned up so that you can get in, start it up, get everything adjusted and get belted in, and drive off.
Author:  Reed [ Wed Oct 31, 2012 10:56 am ]
Post subject:  Re: cold run v warm up
Quote:
Ok, so I've been thinking (terrible idea right?), do I use more gas by letting my slant warm up in morning or just driving it? I know that a cold engine uses more gas than when it's in operating temperatures but idling for 5+ minutes uses gas too. Should I let my car warm all the way to normal operating temperatures? Should I let my car warm up for 30 second to a minute? (let the oil flow and go) or Should I just get in and drive? My drive every morning is a short one, 15 minutes tops (and that if I'm sitting at a red light).

Thanks,
Aspen76
If your commute is only 15 minutes, have you considered a bicycle?
Author:  aspen76 [ Thu Nov 01, 2012 6:18 pm ]
Post subject: 
Ok, so warming up the engine prior to driving will not improve fuel economy. gotcha!

I can and do get in and drive with no difficulty at all. I just wanted to make sure that it wouldn't be beneficial fuel saving wise to allow my car to warm at idle.

Reed, it would save gas to ride a bike but 15 minutes in a car where most of the drive is at 70 mph would be a lot longer on a bike. Also, my drive to work has no side walks (as to not put my life nor my fiance's life at risk pedaling with cars going 70 mph around us in a lane) nor a good shoulder to bike on. Not to mention crossing 4 lanes of traffic, where two are coming off the highway. And then there is my fiance... since we car pool, I think I'll have a hell of a time telling her to climb on a bike at 7 in the morning. Not to mention having to go buy two bikes as neither I nor my fiance have bikes. Bicycling just doesn't seem like the route to take.

Thanks for the clarification Dan,
Aspen76
Author:  phogroian [ Sun Nov 04, 2012 8:13 pm ]
Post subject: 
In the Summer I would let it fast idle from a cold start for 10 seconds before driving it to distribute oil in the engine, then drive gently for the next 30 seconds. In the Winter I would double those times. So the warm-up period for me is quite brief.
Author:  Mroldfart2u [ Mon Nov 05, 2012 11:04 am ]
Post subject: 
Quote:
In the Summer I would let it fast idle from a cold start for 10 seconds before driving it to distribute oil in the engine, then drive gently for the next 30 seconds. In the Winter I would double those times. So the warm-up period for me is quite brief.
X-2.... Thats the way I NORMALLY do it, UNLESS its a particularly a nasty day. (ie snow ice etc, then I let it warm to give me some heater heat, defroster action)
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