Compression Ignition Addict
Join Date: Nov 2010
Location: Western PA
Thanked 90 Times in 86 Posts
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I've never used any fuel additives in my 6.4 but always drain the water separator and buy from high volume places (still can have messed up fuel, you never know, but consensus is less likely).
I run Rotella T6 5w-40 and always go past 5,000 miles.
Do an oil analysis to verify for your truck though b/c you'll never know by just following word of mouth and forum opinions.
I agree if your spread of temps is good, don't mess with any chemical flush. Just flush and switch. I've never used distilled water with any vehicle I've ever owned, never had an issue, city water works fine for me. You can make your own decision on that.
1997 F350 CCLB 7.3
2019 F350 CCSB 6.7 Lariat Sport