In a message dated 98-06-12 09:10:09 EDT, frankenstein@TELPLUS.NET writes:

<< Question - Other than possibly allowing foreign matter into the motor,
 would the lack of an oil filler tube cap adversely affect engine
 performance in any way?  Just curious..... >>

Not performance per se. It could introduce a rough idle, as the PCV (Positive
Crankcase Ventilation) valve would not work correctly. If your PCV doesn't
work correctly (with the cap on) having the cap off, *may* increase
performance, slightly. The crankcase back pressure in reduced by removing the
cap, but the PCV valve normally does a fine job of this.

More than anything, you would just leak huge quantities of unburned
hyrocarbons into the atmosphere, contributing to smog, increased ground-level
ozone, melting of the polar ice-caps, rising sea-levels, fish kills, return of
the feared lizard, GODZILLA, and the end of life as we know it. Well, maybe
not ALL that. :)

Happy Friday, keep your cap on!  :)

gmbulley
cary,nc