Wonder

I ask because I've got a couple interesting tips or hacks on how I can tell if my prius engine or battery is getting too hot. But it's for all Prius.

I went to have my oil changed (I couldn't do it myself this time) and the service guys told me there was no oil filter in my car. I changed my oil last and do remember recognizing the filter I bought was a lil different and had no structure to it, only paper.

I had a little oil loss and my level got quite low. 1qt to 1.5 low. I'm assuming the engine got hot since I figured this all out when my headlight was flickering real bad. When I added oil the headlight worked fine.

So my best guess is the filter melted? Which is scary to think its still within my system. The only other option is that the service place sucked it out with their pump they used to remove the oil. (There's a valve on my drain that they won't touch, installed by previous owner)