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Re: weird noise coming from engine... SOLVED!

We'll...my hunch was correct: dirty oil!  A combination of the extreme 
cold weather and my short commutes to work and back must turned the oil 
in my 90, which was 3400 miles old, into manure.  I have not heard even a 
peep from the motor since I changed the oil and filter.  I presume the 
sound was a cam bearing not getting enough lubrication during warm-up.   

I usually change both the oil and filter every 3000 miles, but the cold 
weather and my lack of free time lately took their toll...