Re: Oil test?
As in Pwrdbym, we also tow. In our case, a Lance 1685 travel trailer which, ready for the road, weighs in around 4600lbs. I did a Blackstone at the 2nd Oil change with 8500 miles on the oil. It came back pretty much normal with a good TBN and could easily have gone to the stock 10k.
And I use Pennzoil Ultra Euro L in ours.
2014 GC Overland 4x4, 3.0CRD, ATG, ORAII ("Smiffy")
2015 Lance 1685 Travel Trailer "#4"
2011 Kia Optima EX-L ("MC"
2003 BMW R1150RT "Darth"