Engine knock on CX-9 GT 2008

[CX-9 forever]

By the way, I am planning to purchase a used mazda cx-9 2008 Touring FWD is the problem on both I mean AWD and FWD or just AWD. Because the car I am planning to buy it has 63,000 miles on it and there is no warranty any suggestions ?? I am going to pick up the car from a used car dealer? I just have given him 1000$ deposit? shall I return my money back or what I will do? helps please

 

[ceric]

5W20 is what the dealer uses and Mazda recommends.
Unless you live in extreme hot or cold areas, 5W20 should cover the range of operations well.