2010, 110k miles, low oil and engine coolant, thoughts?

use 5w30 oil next tome and clean your egr before you blow a headgasket

 

unfortunately, if you don't check your oil between changes, there's no way to know if you have a problem, or they didn't fill the oil properly last time.

as for coolant, you need to pull the shroud off the radiator, and look into the radiator when cold to see if there is any coolant.

 

there are posts here about how much oil is between the dots. i'm not sure, but it might be in the o/m. i think checking it in the morning, cold, is the best.
and there are many threads about 2010 engine issues including oil burning, clogged egr's and head gaskets blowing. you should do some research.

filling the reservoir doesn't always fill the radiator. you really need to make sure the radiator is filled, then top up the reservoir. there are threads about this too.

 

There's no radiator cap on third gen. Yeah, I was incredulous, looked and looked.

 

The only way to fill the engine coolant is through the reservoir because the pressure cap is on there and not on the radiator

I feel you might have a blown head gasket... if you're losing oil and coolant, it's leaking somewhere...

 

Maybe remove the plastic under panel and check for leaks?

 

i would get a cheap endoscope on ebay and check inside each cylinder

 

In my unfortunate experience with blown head gaskets on other cares, the symptoms depended on exactly WHERE the blown head gasket was leaking into: if a section between the coolant tube and an oil tube gave way, the coolant would end up in the oil and give that foamy milky color, but if the section between the coolant tube and the combustion chamber gives way, however, the coolant enters the combustion chamber directly and is consumed, resulting in a fluffy whitish ash on the spark plug electrode, but no oil contamination. (IIRC , I also experienced repeated coolant overheating when the head gasket failed this way, not sure.) Hope this helps