Hey everyone: I recently switched from Ford 5W-20 to Castrol Syntec 0W-30 and I also switched my K&N filter for the stock filter.
Here's the problem: My Stang is now making TERRIBLE gas milage. Around 60 miles per tank less. The oil is noticable thicker than the Ford oil (did the OC myself) and I was cleaning the K&N so I installed the original filter.
Do you think its the air filter? or the oil? Like I said the oil poured thicker than the 0W-30 I installed, however, the engine now runs quieter.
Any suggestions? :canflag:
Here's the problem: My Stang is now making TERRIBLE gas milage. Around 60 miles per tank less. The oil is noticable thicker than the Ford oil (did the OC myself) and I was cleaning the K&N so I installed the original filter.
Do you think its the air filter? or the oil? Like I said the oil poured thicker than the 0W-30 I installed, however, the engine now runs quieter.
Any suggestions? :canflag: