5w-40 from 15w-40 WOW

[boredandstroked]

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.

[mx730md]

how did you get FREE OIL from your dealer? mine wanted $150 for 15 quarts of 5-40

[Galaxie]

Yea, it made a difference for me as well.

[04strokin6.0]

Originally Posted by mx730md

how did you get FREE OIL from your dealer? mine wanted $150 for 15 quarts of 5-40

same here

[boredandstroked]

Originally Posted by mx730md

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.

[ebusa]

Switched to 5W-40 6 months ago!

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

[MelloMike]

How would that oil hold up in the searing heat of Phoenix in the summer?

[boredandstroked]

Originally Posted by MelloMike

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.

[ARN1040]

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.

[pete37922]

thats all i use anymore since 30K miles and now the truck almost has 75K miles on it...luv it !!!