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I know you all have heard of it or used it. I'm going to give it a go in my 2006 F350 6.0 w/276k on the motor. I switched over to 5w40 synthetics long ago after hitting 20k on the truck. I still run the original injectors to this day. I've been reading plenty here and elsewhere about 10w30 oils...

Can I say I'm impressed?? I swear I'm gaining MPGs...mildly albeit maybe 1mpg. I need to do some better MPG calculations. Going to try it again on my next change. I like it!! BTW 2006 F350 6.0 with 219k and the original injectors.

Okay it's been asked around the boards I visit. Given just the simple question without all the variables. IF someone were using synthetic oil and NOT driving the truck often. Could you leave the oil in the truck for 2+ years? Say the truck is driven under 7k miles during that 2 year time frame.

Been reading a few posts. I take from the posts I could use M-1 40w in my diesel yet it doesn't have the API rating called for by Ford. I have a 2006 6.0 that runs like a dream. I have been considering using 10w30 as well. Any information to clear up the API rating of M-1 40w versus Ford specs...

When using any synthetic oil (5w-40) how do I determine what the max operating temperature is for the oil I'm using? I see a ton of manufacturer information but no real data for maximum temperature. Thanks guys!!

What is the consenus of the Motorcraft 5w40? Who is the manfacturer?

What are the basic differences in these oils? What would be the benifits of one over the other in a Ford 6.0L?