How long can you keep an engine block heater plugged in? - Page 2 - Ford Powerstroke Diesel Forum
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post #11 of 30 Old 09-15-2011, 04:30 PM
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I have mine on a timer for 4 hrs before i leave for work.

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post #12 of 30 Old 09-15-2011, 04:40 PM
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Originally Posted by the chad View Post
I have mine on a timer for 4 hrs before i leave for work.
same, can't beat a block heater for these oil burners

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post #13 of 30 Old 09-16-2011, 05:05 PM
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A thread on block heater temps:

Block Heater Temps...by the hour.

The test I did last winter:

This morning I plugged the block heater in. My Scangauge read 39 degrees.

1 hour later it was 80 degrees.

2 hours later was 94 degrees.

3 hours later it was 103 degrees.

4 hours later it was 110 degrees.

5 hours later it was 116 degrees.

Yes, 39 isn't that cold to start, but was interesting to see that it went from 39 to 80 in an hour.

Currently my oil temp in hour 3 is 77 degrees. It was 40 at starting point.

Oil temp after 4 hours is 91 degrees.
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post #14 of 30 Old 09-16-2011, 07:34 PM
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I plug mine in on a timer for 4 hours. The first year I had my truck I left it in all night. Saw a slight change in the bill. Nothing much. $20 more a month about.

A friend of mine leaves his in all night, but he is on call and might need to leave any time.

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post #15 of 30 Old 09-16-2011, 07:36 PM
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4 hours is perfect. anything more and it really dosent heat up much more or is necessary. tho leaving it plugged in overnight wont hurt
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post #16 of 30 Old 09-16-2011, 07:40 PM
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For anyone in the Midwest needing a block heater cord O’relliy auto parts has them for $19. P/N ZRO 360-0008. My local ford dealer wanted $115 for the cord alone.
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post #17 of 30 Old 09-16-2011, 08:51 PM
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I stopped this year. I only used the block heater because I babied my truck. Once I realised that it was a truck, I stopped. I use Mobil 1 5w-40.
I have no stiction issues so far. At home central California, temps are 40*-120* year round. Tahoe it gets allot colder. Once It is below 40 in Tahoe I use the block heater. I like to have a warmer truck when I hop in, and it is better longevity wise. I started my truck when it was 20* block temp with out the block heater and I had no issues what so ever.
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post #18 of 30 Old 09-16-2011, 09:05 PM
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at about what temps would you start to see harder starts? Sorry to go off on a tangent.
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post #19 of 30 Old 09-16-2011, 09:16 PM
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Originally Posted by stockd15b View Post
at about what temps would you start to see harder starts? Sorry to go off on a tangent.
well last winter it was about 50-60*, but with 390k mile injectors that was expected. this summer it was about ninety... truck just didnt want to start after the block air vent mod

Jason

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post #20 of 30 Old 09-16-2011, 09:17 PM
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at about what temps would you start to see harder starts? Sorry to go off on a tangent.

probably 10* and below. If you have a clean system then you will not have any issues that low in temp with 5w-40 oil.
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