Loss of power, no code.

[Adieu]

Up until my 2000 expedition I ran Castrol 20/50 wt oil in all 3 of my 5.0 liter mustangs , 2 Lincoln mark7's 5.0's, and 2 Datsun 240/280z' cars. All of my vehicles topped 185k before moving on. Granted I live just outside San Francisco, so thinner weight was never an issue, as 20/50 flows down to 32 degrees. I even ran car oil in my motorcycle, which wasn't right due to gearbox sharing, but it worked fine. I've always dropped oil/filter at 3k, rarely any more. These days I run 5w30 Mobil 1 in the Expy. I drop oil and filter at 5-6k, way before any recommendations. Clean is always good. Especially if you have 2005 or newer. It's really important to keep clean oil on newer models.

Sent from my N9131 using Tapatalk

Oil's not the same anymore, look at the letter codes on it. New regulations, good for environment, bad for trucks.

For more detergents and less stringent regulation, Diesel Oil seems to be the thing

 

[Vdubnick]

Here's the culprits. Both gaskets blown out.

old thread i know, but thought this was interesting, looks like ford went thru a couple gasket revisions... my 2008 has almost paper like gaskets, your 2011 look more like flat foam, and the latest are a clear molded on silicone bead.

here is my 2008's


new style