Tigger

You'll always have a quart of old oil floating around in your system unless you install it upside down and purge the lines each time you do an oil change. I've heard of a few people getting away with it but there is a chance that it will not work very efficiently as the entire cooler may not completely fill with oil. That could have various effects. Air compresses easily. If you punch it your oil pressure should go up but if the cooler if half empty then it may compress the air inside and not keep oil flow consistent and pressurized as it should be.

Shoulda got a '12. lol. jkjk. I don't know of anyone reporting any serious issues with their oil having the cooler installed the correct way and never getting a complete drain during an oil change. Shouldn't be anything to worry about.

Other than than, just normal maintenance such as checking the lines periodically and making sure no leaks have developed. If any of the lines begin to fray, order new ones and change them immediately. Shouldn't have a problem with that using the coated lines.

I also used a laser-heat checker thingy to check my cooler's oil temp independently from the gauge inside. It was somewhat informative and showed me I had even temps from top to bottom and that was a good indication of flow.