'24 Ford Transit 250 3.5 Castrol GTX HM 7800 miles

[unkillsam]

Don't the transit engines have large capacity oil pans?

12 qt. Yes

My first 1 oil change with the Castrol GTX HM showed that it ended up a 20 weight after 7800 miles

Retesting now with the Quaker State.

 

[BrendanC]

why not try the 20k rated version whether QS or ST and take UOA’s to see if you can get to the rated 15k mileage?

 

[unkillsam]

why not try the 20k rated version whether QS or ST and take UOA’s to see if you can get to the rated 15k mileage?

So i am still in the process of learning. That could be an option to explore once I get the UOA back from my first QSFS oil change at 10k miles.

Thanks for the idea!