I have a horrible oil leak. I have replaced the oil pump,oil pan gasket and it still leaks.the chiltons manual says it could be oil pressure sending unit. its a 98 avenger es. can any one help me figure out this problem??

 

Welcome to DF! Moving to Avenger section for ya.

 

need to be a little more specific as to where the oil leak is at front/sides back ? picture are a help as well

 

it is leaking on the right side(passengers side) towards the back, behind all the pullys.

 

Again not enough info, I'd be checking the head gasket and valve cover gaskets

 

I had a similar leak. Replaced the valve cover gaskets. It was the rear cam seal. I replaced it when I did the timing belt.

 

how hard is it to replace that rear cam seal? do I have to take off the oil pump to get to it?

 

You need to check the gaskets Bad Venge mentioned first. They are the most common cause. Cam seals need a good mechanic or someone mechanically inclined. If you have never changed a timing belt or done a major mechanical job on a car, you need to hire a pro.