With my Focus ST, i ran a couple catch cans on it. I would find it pretty clean during the summer months, but once the weather cooled off i would regularly grab a few ounces of milkshake...The ranger seems to do about the same for me.I think there was the suggestion that after so many miles the catch can wouldn't collect as much crap as the engine would be fully broken in. I don't have a pic but at nearly 30K miles mine just puked up a disgusting amount of milkshake. ?
I think that this is a very good suggestion! I have been researching this oil and viscosity for some time. It appears to be superior in almost every category important to TGDI engines. I am hoping that it staves off, or at least slows the accumulation of the crud on the valve stems.In my experience I've had best results with Rotella T6 5W-40 in both Ecoboosts I've owned. Any other brand of oil and it reeks of fuel and is diluted to the consistency of water by 3-4000miles.