I Have a 2008 FX4 V8 5.4of course,with 47,000 miles.The oil in it has about 2,600 miles on it since it was last changed.The color of the oil is a medium brown in color and you can still see through it. Ive read on here that seafoam is a mild cleaner and i change my oil every 4,000 miles so i don't think i need kreen.Would it hurt to run some seafoam through the oil? If so how often does everyone run seafoam in their oil?

 

i just put it in the brake booster line about every couple of oil changes, dont know about putting it in the oil tho

 

Seafoam is not a cleaner, it's a solvent. I wouldn't put it in my oil if you paid me.

https://www.f150forum.com/f7/411-additives-63987/

 

Ive put it in the oil before... But i just ran it for a few mins.. then changed the oil..