if its bran new give it till about 10-15 to get the rings good and seated...then switch to synthetic oil if you want to and check out H&S programmers...they are the only ones doing decent things on the new urea regen diesels....I run EFI live on my dmax and they wont even touch the 2011's...WHATEVER YOU DO STAY AWAY FROM BULLY DOG....very dirty tunes in there programing. all they do is dump the fuel for power and dont increase pump timing enough for the amount of fuel per tune. Fuel only tunes will leave distinct fire rings on the pistons an if ever a warranty issue its a give away to a service writer. Also look into SCT and TS performance, 2 other good ford tuners. And the only way your gonna get good mileage towing is to completely get rid of all the emisions crap...and i mean all of it, pcv, egr, urea injection, cat dpf and muffler!!
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