5w-40 from 15w-40 WOW - Ford Powerstroke Diesel Forum
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post #1 of 34 Old 12-22-2009, 12:24 AM Thread Starter
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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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post #2 of 34 Old 12-22-2009, 06:02 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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post #3 of 34 Old 12-22-2009, 06:57 AM
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Yea, it made a difference for me as well.

Colin
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post #4 of 34 Old 12-22-2009, 07:25 AM
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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

My Fleet
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post #5 of 34 Old 12-22-2009, 09:06 AM Thread Starter
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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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post #6 of 34 Old 12-22-2009, 10:43 AM
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Switched to 5W-40 6 months ago!

Much Better! Using Full Synthetic Mobil 1 5W-40 Turbo Diesel Truck.

-Evan

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post #7 of 34 Old 12-22-2009, 11:24 AM
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How would that oil hold up in the searing heat of Phoenix in the summer?
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post #8 of 34 Old 12-22-2009, 04:12 PM Thread Starter
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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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post #9 of 34 Old 12-22-2009, 04:51 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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post #10 of 34 Old 12-22-2009, 04:53 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 !!!

-Mike-
2006 F-350 Lariat, Supercab, 6.0L, 3.73's...Rhinolined Bed...6 Spd Handshaker...Mag-Hytec Diff. Covers...Smoked Recon Lights...Amsoil oils front 2 back...Optima Yellow Tops...MBRP 5" ST8 Pipe, Turbo Back...Dieselsite Coolant Filter...Amsoil/Injen CAI...SCT SF3 Canned Tunes 4 Now...CFM Intake Manifold and Boost Tube...Blue Spring Upgrade...Edge Insite CTS !!!
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