Check out these Seafoam Instructions
The “definitive” answer… from Jim Davis at Seafoam. He sent me three technical bulletins as well as confirming in his email that it can be used as a pre-cleaner before an oil change, as well as after-care for fresh oil between oil changes… in a gas engine. I am cutting and pasting the first bulletin so all can see.
Sea Foam Motor Treatment used in Crankcase Oil
All Gasoline and Diesel, Rotary style engines
Sea Foam Motor Treatment is a Blended Petroleum Product, NOT A CHEMICAL and is widely used as an old oil residue reducer and moisture drier in any oil crankcase.
Sea Foam Motor Treatment is most commonly used as a pre service, old oil residue re-liquefier / cleaner / diagnostic tool, and moisture drier, and is also used as an after service additive. Sea Foam Motor Treatment does NOT add significantly to oil volume, so removing oil is NOT required for use, when used according to printed directions on the product container.
1. As a PRE SERVICE CLEANER for old oil residue, (sticky rings or valve train noise, diagnostics), pour 1 ½ ounces of Sea Foam Motor Treatment into the engine oil crankcase for EACH quart of crankcase oil capacity including filter. (Diesels use 1 pint Sea Foam to 4 gallons of oil, please.) Drive a MINIMUM of 30 minutes/miles, MAXIMUM 200 miles, (Diesels 1 hour drive/run time MINIMUM) and then do your oil change service (LOF). This is the process of safely/slowly re liquefying the old oil residue so contaminants may flow and be filtered. This also makes your old oil dirtier, quickly, so a LOF service is necessary when the oil gets dirty. Great for Turbo & Supercharged applications where hot oils deteriorate so quickly due to heat, those residues NEED CLEANING. (LOF = Lube oil & Filter service = OIL CHANGE).
2. As an AFTER SERVICE ADDITIVE into fresh oil, nearly fresh oil, or oil (used condition) that is NOT ready to be changed (by mileage), put 1 ½ ounces Sea Foam Motor Treatment into the crankcase per quart of capacity as described above, then SELF SET a program to MONITOR your oil for proper level, color and clarity on a mileage, timed, or event basis (like every time you add fuel, etc.) to determine when an oil service is necessary. (LOF) When the oil gets dirty, CHANGE IT!
Sea Foam Motor Treatment will safely and slowly re liquefy old oil residue, This will usually make your oil need changing BEFORE your normal scheduled LOF service. Only your monitoring of the oil for color and clarity can tell when it is time to do LOF (oil change service), or 3,000 miles, whichever comes first.
Synthetic oils, both blends and 100%, were engineered and are manufactured to be 100% compatible with petroleum based oils, all brands, and vice/versa. Without compatibility, oil manufacturers and engineers would be liable for the results of mixing non-compatible lubricants.
Check your oil; monitor its level, color & clarity to determine the need for an LOF service! Change your oil when it gets dirty!
Read In Full:
The Official Seafoam Instructions
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