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Dipstick oddness (blow-by?) 200 1988

I changed the oil 300 miles ago. Right afterwards, I noticed that
the dipstick was out of its hole, and that the engine had coated the
surrounding area with a fine mist of oil. I cleaned things up and
stuck the stick back in the hole.
.
Today, I noticed that the same thing had happened again. I replaced
the o-ring on the dipstick and stuck it back in the hole. I ran
the engine at various RPMs with the dipstick out, and no blowby
came out of the tube. The oil cap (plastic) jiggles a bit at idle
when set on top of the filler, but if I push it down briefly to
make the seal grip, it sucks down tight. The flame trap was
cleaned recently, and the car doesn't leak oil from anywhere else.
.
Could the dipstick have vibrated out of the hole? The o-ring was
old and dried out - it barely held it in the tube. On a car in good
shape, if you drive it with the dipstick out, should some oil mist
rise up out of the tube?
.
Maybe I was careless and didn't push the dipstick in well both times.
I did check my oil yesterday, so carelessness is a possibility.
.
TIA -b.






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