On the advice of acquaintances and friends in the marine diesel manufacturing industry we use two additives, both by Hammonds. One is a bug killer the other is a lubricity booster. We've used both for the 17 years we've owned our FL120-powered cruiser in the PNW.
Don't know if they help but they don't hurt and the reasons for using both of them, particularly the lubricity booster for the old jerk-injection FL120s, are sound in my opinion.
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