Originally Posted By: Frank D
How long was that filter in use?
Always change OIL and Filter between 3500 Miles and 5000 Miles, depends if there is a deal on Oil and filter at AAP or AZ..
However this truck with a I6 Its really refereed to as a 4.2L 256CI L6 FI
Im sure F1 means FUEL INJECTED and Im not sure what CI stands for, I think 256 might mean 256 Cubic Inch, and the L6 means Inline 6
,,, its a straight 6 Not V6 sry about that mistake , so used to talking about my Honda w/V6
I should refer to it as a 6 cylinder ...
anyways when it hit near 75K i started to use MaxLife and MMO just to clean out all the slug that these ENGINES are know to make....
now this last change I went with 100% Syn.. 5 QT of Valvoline SynPower 5W30 and 1 QT of MMO and 1 QT of Peak FULL SYN 5W30
thats 7 QTs Total.
Also I just changed the spark Plugs and what I found very strange was when I took off number 5 spark plug boot the spark plug was broke... but not broke in half... it was split down the side however it didnt hit the middle of the plug, as if you were to take a knife and cut off a sliver....
anways just replaced with $2.99 a plug Denso PTV16TT Platinum TT Spark Plugs
It had A/C Iridium's what were wore out and as I said 1 broke... Probably from heat.
I dunno..