i have a 1995 plymouth neon. currently using Mobil 1 Extended Performance 5w30. using a purolaotr pure one filter. this is the only filter ive ever used, whenre my oil has msotly stayed amber/gold coored after 3 months! any othe rfilter, oil would have been already deep black. i put about 1,000 miles on my car, every 3 months. question is.... an i actually go 6 months, 6,000 miles, with smae oil and filter? or should i change the oil every 3 months, regardless if its conventional or synthetic? i hear oil breaks down, if the propre mileage isnt being put on it. thats why most say 3 months or 3,000 miles whichever comes first. what do you all think?