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I used to have a 72 Bus and I had a situation where my oil was getting
thinner.  And fuller!  The culprit was the fuel pump--it was designed in
such a way that when it went bad it allowed gasoline to get into the oil.

Dave, I would check this.

Will Self
Billings, Montana
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What exactly went bad, I think I am having a similar problem.  I have a 73, I
know that gas doesn't make the best lubricant, and I would like to remedy this
problem without a complete teardown.

Matt Rathke, City of Seattle
"I go dddaaadddddyyyyy'ssss car, now  !!!" Taylor, age 2.5