Many yrs ago, Car Talk Radio show said change oil every 4k - then we were using regular oil (not Full Syn).
So since I moved to Full Syn, I started doing it every 5k despite Mobil 1 tells me to do every 7k. Oil gets dark but color of oil should not be the factor. Another guy said that color gets dark because of the oil filter. So I used Wix but I do not think there is a change in color.
- How often should I change my Mobil 1 5W30?
- Which filter should I use?
- Carbon build up - Valves
M/c tells me that my car has above avg carbon build up.
What really works to treat Carbon build up - DIY (other than having M/c using his specialized tools)?