Synthetic Oil Making things worse?
Amateur
Joined: May 2010
Posts: 38
Likes: 0
From: Alberta Canada
So I did an oil change and decided to upgrade to synthetic oil. So I did and put a new oil filter in. It seems to be after I changed my gas mileage got worse! I was getting 17 to 18 mpg on the highway but now im getting 14 to 15. Well what the heck? Any advice would be wonderful! Should I do another oil change or what? Oh yes a second issue. when I press the gas pedal down at this same spot it makes an annoying high pitch squeeling noise no matter what speed im going its right when I hit this one spot about a quarter of the way down. Im guessing the throttle body? Anyone have a problem like this or any advice? Thanks for your help on both issues!!!
Rookie
Joined: Aug 2010
Posts: 67
Likes: 0
Sounds to me like you are loosing a idler pulley or a belt-tensioner pulley. I would pull the belt and start it up and see if it goes away. If it does, start spinning pulleys by hand and feel which one rolls rough and isn't smooth. Take you 5 minutes to figure it out.
Aaron
Aaron