How much Sea Foam in oil for motorcycle that has been sitting? [SOLVED]

I am working on a 1995 Kawasaki Ninja that sat for 15+ years with fuel and oil in it. I intend to use Sea Foam Motor Treatment in the tank to reduce some of the varnish issues but I also wanted to add Sea Foam to the crankcase before draining and changing the oil. The crankcase oil is low enough that I can’t see it in the level window so I have no idea how much oil is actually in the crankcase. How much Sea Foam can I safely add to the crankcase? Also, I’d like to let the Sea Foam sit in the crankcase for weeks if not a month or more before draining it; will leaving it in the crankcase this long be a problem?

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Jim D.
Jim D.
1 year ago

Good question, Jeff. In fuel: use a strong concentration of Sea Foam to help clean, lubricate and protect your entre fuel system. Use 4-6 ounces of Sea Foam per gallon of gasoline. If the fuel system is very dirty, use more Sea Foam. You can add up to a 50/50 ratio of Sea Foam and fresh fuel without any performance concerns. Because Sea Foam Motor Treatment is made from 100% highly refined petroleum products and does not contain any harsh chemicals or cleaners it is safe to use on all seals, O-rings and gaskets.

In crankcase oil: we recommend using 1 ounce of Sea Foam Motor Treatment per quart of engine oil. Because you are low on oil, I would add approximately 3.5 ounces of Sea Foam Motor Treatment to the crankcase and top off the oil until it is full. The 3.5 ounces is based on a quick Google search for 1995 Kawasaki Ninja oil capacity. Check your owners manual for oil capacity.

Once Sea Foam Motor Treatment is in the engine oil it can stay there for as long as needed. I’d run the bike for 1-2 hours before changing the oil. That will let the Sea Foam circulate and clean. Timeline wise, you can leave Sea Foam Motor Treatment in for as long as you want to.