5w-40 from 15w-40 WOW - Ford Powerstroke Diesel Forum
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  #1  
Old 12-21-2009, 11:24 PM
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5w-40 from 15w-40 WOW

well my truck has been annoying me with it's clatter on cold start so I decided with all the chatter about injectors and snake oil I would just try a 5w-40. What a HUGE difference in the way the truck idles and starts. It is in the 30s here so not super cold. The difference is NIGHT AND DAY. And the 15w-40 synthetic I drained out only had a little over 1000 miles on it. I used the 5w-40 full synthetic Motorcraft since it was free from the dealer. I am absolutely amazed and very pleased with the difference. Any one still running 15w-40 needs to quit and get on the 5w-40 train.
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  #2  
Old 12-22-2009, 05:02 AM
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how did you get FREE OIL from your dealer? mine wanted $150 for 15 quarts of 5-40
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  #3  
Old 12-22-2009, 05:57 AM
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Yea, it made a difference for me as well.
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Old 12-22-2009, 06:25 AM
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Quote:
Originally Posted by mx730md View Post
how did you get FREE OIL from your dealer? mine wanted $150 for 15 quarts of 5-40
same here
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  #5  
Old 12-22-2009, 08:06 AM
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Quote:
Originally Posted by mx730md View Post
how did you get FREE OIL from your dealer? mine wanted $150 for 15 quarts of 5-40
They had to do an oil change as part of a service they did, no special secret sorry. I was just smart enough to say hey, I want 5-40.
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  #6  
Old 12-22-2009, 09:43 AM
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Switched to 5W-40 6 months ago!

Much Better! Using Full Synthetic Mobil 1 5W-40 Turbo Diesel Truck.
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  #7  
Old 12-22-2009, 10:24 AM
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How would that oil hold up in the searing heat of Phoenix in the summer?
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  #8  
Old 12-22-2009, 03:12 PM
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Originally Posted by MelloMike View Post
How would that oil hold up in the searing heat of Phoenix in the summer?
Great the hot weight is the same 40. And going to a full synthetic if you aren't using one already will help with the heat too.
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  #9  
Old 12-22-2009, 03:51 PM
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I too did the switch. Very happy. Doubt I'll ever switch back. Cold starts are so much easier and the truck seems to all around run better.
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  #10  
Old 12-22-2009, 03:53 PM
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thats all i use anymore since 30K miles and now the truck almost has 75K miles on it...luv it !!!
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