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1. How often do you all change your engine oil? I just bought a 2003 Jeep Liberty Renegade with 228k miles (some will call me crazy), and I just did an oil change on it. I used the Mobil 1 High Mileage 5W-30 Full Synthetic oil with the Mobil 1 Oil Filter, I was thinking around maybe 5K mile...

I've checked on different forums and have heard every brand under the sun from copper to platinum to double platinum to iridium. What do you all use? Has anyone noticed problems using a platinum or iridium plug?

Bought my son his first car and its a 2003 Jeep Liberty Renegade, and I think its about time for a coolant change. When I look in the coolant tank, the coolant is slightly murky, though not too much. I looked at the service manual and it mentions a cylinder block drain plug, but doesnt mention...