I would add some biocide as well. My favorite is VALVTECT BioGuard Fuel Microbiocide.

"Specially formulated biocide for marine applications. Test proven up to 90% more effectivethan other products and works in as little as 2–3 hours versus other biocides that require up to 36 hours.

* Kills bacteria quickly
* Breaks up slime
* Prevents filter plugging and corrosion
* Pint treats 480–960 gallons"

Attached Thumbnails

 

__________________
1999 E300DT (131,800) 154,000 Black on Black SOLD

2006 CLK 500 coupe Capri Blue on Grey (zoom,zoom)
47,000mi

04 VW TDI Passat 80,000mi
(Techno)

How to eliminate oil dependency through market-driven approaches.
“We could cut oil use in half by 2025, and by 2040, oil use could be zero,”
The Sound of Diesel Speed
Ode to MB