Originally Posted by Kandy OrangeZ

My fittings are facing up...as for gravity plaing a role, I dont agree. Yes the pan sits lower than the cooler, but oil would have to magically be pulled upwards out of the oil cooler in order to drain into the pan or stay in the lines. The way the lines are routed, a section of line is higher than both the sandwich adapter and oil cooler (up out of oil cooler, around passenger side frame rail, into sandwich adapter, I dont think very much oil will still be in the lines once the Z is turned off. Itll drain into the pan or into the oil cooler.

I dont mean to be argumenitive, just simply saying, i feel like the cooler should be drained, due to the fact that there IS at least 1 qt of oil in it. Thatd be like doing an oil change without an oil cooler, draining 4.25 qts and leaving the rest in the pan. Then adding new oil to the remaining old oil.
Just giving everyone something to think about