I changed the plugs today in my Mazda 626. Every cylinder was full of oil. What is the..

[Derrick]

...cause of this? Should I drive this car like this? How long will this car last? How much could this cost to repair?

 

[clncarplz]

Try changing the plugs to a slightly hotter ones (the part man will tell you which ones to get) bring your old ones with you. If this doesn't help then you are looking at having to overhaul the motor.
You can still drive it for a long time.
Costs could be a new set of plugs up to a new motor.

 

[Erock]

MY SATURN IS DOING THE SAME THING it ran OK for a month but now it wont start. it is a messed up gasket or something. tomorrow im going to put new plugs in again to see if that works and if it doesnt im going to either get a new motor or have it fixed at a saturn place