Am I burning oil? 7.5 quarts in but only 5 quarts out.
 

A few months ago I had a 25-row Stillen oil cooler installed.

The guy who did it said it took about 7.5 quarts of ester oil and that sounded about right.

Fast forward to today when I took it in for an oil change. I provided the tech with the 8 quarts of ester oil and told him that's how much it'll need. I picked up my car and went home. Later I opened up my trunk and noticed I still have 3 bottles of ester oil left over. I called the tech and he said it only needed 5 quarts. I checked the dip stick earlier and it looks right.

So I thought about it for a while and I'm reasoning that there's about 2.5 quarts of oil still in the engine, lines, and cooler itself. It's kinda like maple syrup inside a bottle, you can try to pour all of it out but some of it will stick to walls and never come out. Do you suppose this is the case? Or should I be worried that my Z is burning oil?

when you first install a cooler, you need some additional oil in it.
a 25 row shouldnt add more than a quart.

so your looking at around 6.5 quarts on a complete oil change.

When yo change the oil after that, it doesnt fully drain the oil cooler and/or lines so you only need around 5 to 5.5 quarts per change until you also dump the oil from inside the cooler.

and think about it, if you were burning oil you would be needing MORE oil.. not less.

Thanks! =)

+1 rep for you.

Sounds as if the first guy charged you for 7.5 or 8 quarts and only used 6.

I agree... I have the same Setrab 25 row oil cooler. I put in 6qts and the stick reads right at "H". I burn 1qt every 3,000 miles.