Hello! Have a big problems need a good advice! 2003 2.7L
 

I have bought 2 month ago from dealer 2003 Chrysler - Sebring GTC 2.7L for 4000$. So now I have few problems and I make diagnostic in Universal Service. 1) Oil light is flashing. - They said need replace oil sneder first, possible oil pump. 2) After running for 20 minutes. Stop it and vehicle won't start again, need wait about 20 min and I can go again, but if I go again 2-5 miles engine overheats and the temperature is high. - They said Vihicle has blow head gasket, estimate; over 2000$ to repair it. What I have to do? Give me please good advice.

I made ​​a big mistake. I changed oil month ago and I don't know what is oil 5W-30 or 5W-40 maybe 10W-30. So later I was add about 600ml maybe another oil in my car. I mean I mixed 5W30 and 10W40 I think =((. Maybe need to change oil again?

How much cost used engine for my car? I can't find =((.

Can't find? You're not looking very hard.

2003 Chrysler Sebring Engine (Used Sedan 2.7L VIN R) For Sale - Chrysler Engines & Motors Sales

You might be better off selling the car to someone who is willing and able to repair it and getting a different car. Otherwise you are going to wind up pouring much more into that car than it's worth.