Seafoam can actually be left in the crankcase and does not have to be flushed :
For the crankcase:
from their website:http://www.seafoamsales.com/tech-info-diesel-engines/
(For all diesel engines)
Sea Foam Motor Treatment may be used in an oil crankcase 2 separate ways, depending on your needs and expectations. Sea Foam Motor Treatment is most commonly used as a pre-service, old oil residue re-liquefier / cleaner and moisture drier. It can also be used as an after-service oil additive. In either application, Sea Foam Motor Treatment will safely and slowly re-liquefy old oil residue. Each method is described below:1. As a pre service cleaner in diesel engines
, to treat old oil residue, sticky rings or valve train noise. One pint Sea Foam Motor Treatment will treat 2.5 gallons of oil (NOTE: this is different for gasoline engines – see separate tech bulletin.) Drive a MINIMUM of 30 minutes/miles, MAXIMUM 60 minutes/ miles, and then do your oil change service. This begins 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 oil change service is necessary when the oil gets dirty. Great for Turbocharged & Supercharged applications where oils deteriorate so quickly due to heat, and leave those residues that NEED CLEANING.2. As an after service additive into fresh oil, nearly fresh oil, or oil (used condition) that is NOT ready to be changed
(based on mileage since last oil change), put the same amount of Sea Foam Motor Treatment into the crankcase as described above, and then regularly monitor your oil for color and clarity. Set a predetermined schedule for checking the oil condition on a mileage, timed, or event basis (like every time you add fuel, etc.) to determine when an oil service is necessary. Monitoring of the oil for color and clarity will tell you when it is time to do an oil change service. NOTE: Do not exceed 3,000 miles without changing the oil.
Sea Foam is safe to use with all synthetic oils. 100% synthetic oils, and blends of synthetic and petroleum-based oils, were engineered and are manufactured to be 100% compatible with petroleum based oils, all brands, and vice/versa. Without this compatibility, oil manufacturers and engineers would be liable for the results of mixing non-compatible lubricants. Since Sea Foam ONLY contains petroleum oils, it is entirely compatible with synthetic oils.
Remember! When Using Sea Foam in Your Crankcase:
•Check your oil and monitor its color & clarity to determine need for a oil change service!
•Change your oil when it gets dirty!