in the winter my windows roll up really slow. why is that? I have replaced the regulators and oiled them but it dosn't seem to help. Do I need to replace the motors or would that be a waist of money?

 

If all four behave the same way, it points to a common problem.
- check charge voltage, maybe low? (13.8-14.6V). Check supply voltage also from drivers door, from motor connections while running window(s) up... If voltage is a problem, give direct supply from a healthy batt to the motor connector and see if any speed difference.
- connector(s) oxidized in input supply wiring
- grounding points oxidized
- circuit breaker bad at smj (voltage heat loss)
- motors wear down only if constantly used. Rusting/Water is more problematic... Should last 'car lifetime' -if- mechanism is kept well oiled. Needs maint minimum once in 4yrs, depends on where the car sits.... But if already replaced, maybe needs only window guide lubrication?
see door related schemas at: http://www.cardomain.com/ride/748507/13 also check Favorite Links top left.

 

I agree - window guide lubrication is your problem