My 0-200, 700 hours since new, I have been using 

Phillips 100w for the last couple of years.

I always have some blowby out the vent tube

that gets the bottom of my fuselage oily, not a lot, but enough to

clean after each flight.

I inherited a box of Shell 100w, couple of hours, almost no 

blowby.

I don’t see this as a problem, but curious as to how this is

possible.

oil levels are the same, viscosity same, both mineral oils, non synthetic.

Any ideas?

Dave

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Interesting.

Running Phillips, perchance did you operate in a more dusty environment that might have just highlighted the blowby?

Nothing has changed

an A & P told me that the shell product contains cam guard, can it possibly work that fast, 2 hours flight time?

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