What does fuel in your engine oil mean?
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Intermediate
Joined: Aug 2010
Posts: 33
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From: Madison, MS
What does fuel in your engine oil mean?
A biker friend has been told his engine oil contained a small amount of fuel (3-4%) by a respected oil analysis lab. What does that mean?
The testing lab was Blackstone Labs in Fort Wayne, IN. Anybody heard of them? Used them?
The testing lab was Blackstone Labs in Fort Wayne, IN. Anybody heard of them? Used them?
Thread Starter
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Intermediate
Joined: Aug 2010
Posts: 33
Likes: 0
From: Madison, MS
Wouldn't having some fuel in the engine oil be a normal and natural thing? If it is too much fuel, reducing the viscosity of the oil, what can you do about it? Other than just change the oil, does it mean you have to rebuild the engine and install new rings?
Advanced
Joined: Sep 2010
Posts: 86
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From: Marquette, Michigan
If his bike has carbs he may need them rebuilt as they may be leaking fuel when the engine is not running. If he has a fuel line shut off he could shut the valve which would limit the mount of fuel that leaks through the carbs while the engine is not running. Over chocking can cause fuel to bypass the rings and end up in the crank case also. Injection I know nothing about. He should have it looked at by someone who is qualified as to a solution to the problem if it is one. Maybe it is normal to have this much fuel in the oil as you put miles on the bike. Maybe the oil test provides to much info. and confuses things. Not many bikers have it done so its hard to find comparables.
j.L.
j.L.
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Presuming the engine is in average condition I would suspect lots of short trips. Lots of warm up cycles and not much high, sustained heat to boil the bypassed fuel out of the oil. Any of the things mentioned above are reasonable causes but if he does lots of short trips, that is the likely cause and everything else is "healthy". I am also among the large number who have no idea what "normal" would be. Perhaps the company doing the analysis could provide info on the normal range. There may be no problem at all.
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