I have a 2017 Kia Sedona. It is maintained to the owner’s manual. I always do the oil changes at Big-O-Tires, same shop. On 25 July, 2021 at 35562 mileage, the tech called to say that the Drain Plug was stuck and I had to replace the pan ($300). I pushed back. I showed that they had done the prior oil-change so they should be owning the problem. After a day of going back-n-forth, they finally owned up and said “Drain Plug had debris” and they replaced the drain plug but not the oil-pan. I had a non-big-o-tire Master-Tech then check that there was no apparent oil leak and I moved on. NOTE: The prior oil change, due to covid reducing the car usage, was at 31805 miles on Dec 15, 2019 (3757 miles and ~1.5 years earlier).
ISSUE: I track gas filled in my cars religiously in an Excel file. Since Mar 2021 to Jul 22, 2021 my mileage was 17.79 MPG (1299 miles) while after July 31, 2021 to Sep 13, 2021 we drove 403 miles during which it has step-function dropped as shown in the table below to 14.43 MPG (by 19%) and is seen at each gas-fill.
Date Miles / Gal
On JULY 25: Oil Change issue describe above…
***QUESTION: Could the reason for 19% step function drop in the mileage I get be anything related to the oil-change issue described above? If so, how and your suggestion on how should I proceed… ***
- We have not seen such a drop in mileage for any of our cars in the last decade.
- We are two drivers in the household but I am consistently the primary driver on this car before and after the oil-change.
- The car has not change its typical routes i.e. from highway to city.
- There is no alarm for tire pressure being off and I check the tire pressure periodically. I can check again tomorrow.
Please comment on the question above.