First off, thanks for taking the time to read my post... I have been having quite a rough time fixing a P0345 code on my 06 F-150 w/5.4 w/85,000. This truck has gone to a Ford dealer every 5K for the oil change/checkup etc.
Long and short - P0345 Code @ approx 83,500 miles, rough idle once the engine was up to temp and it would clear if you bumped the skinny pedal.
Going to trade it in I put the 15W40 in today... 40 psi @ hot idle ~700 rpm and 75 psi @ 2000 plus rpm.
The P0345 code didn't rear its ugly head in the 1 hour of around the town driving. It never idled rough, nor did it attempt to stall.. Which makes sense because the cam phasers are now getting enough oil pressure.
Maybe but I doubt it.. since I got higher oil pressure with the 15W40 oil... But I am done turning wrench on this truck... The only way I will continue to turn wrench is if a dealership REALLY lowballs my trade-in value...