read alot of different threads on seafoam i know it works but like some i had concerns about how long to leave it in the crankcase so i wrote the folks that make it and here is a copy of what they wrote back. I havent changed oil yet since i did the treatment shortly after my oil change. close to a thousand miles still in the crankcase working great. seafoam writes:::::::: Thank you for using Sea Foam. If people on the net compare me with B-12, I am totally at a loss for words. We are entirely different. B-12 is a Chemical blend containing harsh chemicals which when over-used can damage fuel system parts that are plastic, rubber, neoprene, etc. Sea Foam is a 100% pure petroleum produce that is totally safe in ANY engine, and can be used ANY where in that engine to solve a lot of cleanliness problems. In the oil, it totally depends on why you are using it. For Preventive maintenance, we suggest 1/2 can about 100 miles before you change oil and filter, then the other 1/2 can into the new oil as an additive. Because it is 100% pure petroleum, you can leave it in. REMEMBER - the rule of thumb - when oil is dirty - change it. The addition of a cleaner may probably tend to make the oil dirtier - quicker - so keep an eye on it. Hope this answers your concerns, Dale C. Lackore
National Sales Manager
Sea Foam Sales Company |