2019 3500 tradesman..Okay have you seen this happen? I searched but didn’t see it. Went to a local oil change place and brought my own oil. Motorcraft 10/30 diesel 3 gallons. After the oil change today I noticed milage indicator (usually around 17-20mpg unloaded) DROPPED...even at idle in neutral the digital display went to 4.0 mpg and kept dropping. Truck “seems” to run okay..but that was weird...any ideas? Went home and it slowly went back to around 15-16mpg BTW my wife noticed oil drips on the driveway but the oil change place re-inspected it and said that the fellow below didnt “clean it up properly”. Does a lot of oil splash that much when draining? Since then seems to be no dripping.