One of the major downfalls to long engine life was the introduction of the
paper element air filter. If you recall, from the mid 1950's back, almost
all internal combustion engines had oil bath air cleaners on them (even our
lawn mower did). They filter out nearly all airborne junk. The paper ones
only keep out the big chunks. That's why cars in the past had oil filters
as an option and by-pass at that. The MAJOR draw back to oil bath is the
H.P. needed to suck air through it. That was the first thing to go for a
few 'free ponies' from your engine. Hopefully, air filter technology has
improved to the point that it can keep out as much crud as the oil baths
did.
Larry S.
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