Oil additive f350. 7.3 2001

marcsbigfoot20b27 wrote:
My 7.3 in my sig gets an additive custom mix.

1 dose of Optilube XPD, Diesel Kleen + Cetane, 1/2 quart synthetic Super Tec 2 stroke oil.
Truck runs great and makes less noise.
Of course on the 140 hp tune it does whistle a little. ;)

Early 99 7.3 Superduty bought new in July 98, sold in March 2014 . Going on 16 years , never once did I need or use any fuel additive. IMO a waste of money. It was running just as good as the day I bought it .

I ran a DP tuner, and as far as noisy, ya it was, and whatever you have done to think it is quieter, maybe, but they are just plain noisy, and nothing is going to change that much to not be obnoxious . Big reason the noise of the 7.3 comes up all the time, they are NOISY