I have A 2002 Denali wanting to change plugs and wires to increase mileage. I am getting 17 mpgs now with a 6.0 Thinking of trying Bosch Platinum Ir Fusion but have been hearing some bad things any ideas
People get down on oil blenders having marketing campaigns...their barrage of marketing is nothing compared to companies that manufacture and distribute spark plugs! Follow OEM and get many more years of service...yours were probably Delco Platinum plugs.
Accually I am getting 17.5 on this tank about 70% hyway it is stock 90K on it I did increase air pressure about 10# and did a seafoam treatment Next is auto RX in engine and trans was getting 15 to 16 did a seafoam treatment
I am still wanting to try iridium plugs but maybe not the bosch I hear good things about Delco and Denso But Bosch I hear a lot of problems even burning out coils
I would avoid Bosch spark plugs. They are too iffy. Their new designs just have problems and misfires. Their old ones were great.
Other Bosch products can be superb, though.
Like the guys said - get factory [probably AC Delco] plugs.
Don't waste your time trying to gain fuel economy out of a truck with spark plugs and wires for your true problem has to do with vehicle weight itself that the engine has to propel (+occupant(s)) and your gain will be so minor that you'll be better off doing with bicycles or smaller displacement/lighter weight vehicles.
Originally Posted By: KA426
I was raised to put Champions in a Mopar, Autolites in a Ford, and AC Delco in a GM. This formula has never let me down yet.
Motorcraft in a Ford. I've had Autolites act up a couple of times in a Ford. Got em in my Jeep and they are ok so far.