2018 Mercedes GLC.
Have been running Pennzoil Platinum Euro L SAE 5W-30 for the last three changes or 14k miles. Average fuel economy stayed at 25.5-25.7 mpg during this time. I recently changed to Valvoline European Vehicle 5W-40 and noticed my fuel mileage has dropped to 24.7 mpg.
I thought that was interesting.
Have been running Pennzoil Platinum Euro L SAE 5W-30 for the last three changes or 14k miles. Average fuel economy stayed at 25.5-25.7 mpg during this time. I recently changed to Valvoline European Vehicle 5W-40 and noticed my fuel mileage has dropped to 24.7 mpg.
I thought that was interesting.