Wanted to try some conventional ST to see how it would hold up as I was running low on some of my thinner oils for the relatively mild "winter" here in north Florida. I bought this truck from the original owners who'd had it dealership serviced including oil changes every 3,000 since new. I have many many more samples to upload for this truck. Interestingly enough the switch to 5w30 oil from the previously used 10w40 netted about a 1.5-2.5 MPG incrase, with either oil the truck has 75-85 PSI of oil pressure at hwy speeds, considering a 5w20 on the next OCI. Current fill is Liqui Moly 10w40 MOS2 with a return to the previous mileage loss noted with the 10w40. Total engine miles at time of sample were 312,391, engine has never been rebuilt, but did have a valve job around 277k. This run could've easily gone 5,000 miles imho.