Oil Catch Can

[06YarisRS]

Originally Posted by matthewai

its stock right now (k&n drop in) I added the catch can about a month ago just because I think its a good idea to keep the engine cleaner. havent noticed any difference but I dont even know what id be looking for or "feeling" for by how it drives or uses gas . I usually put the mid octane fuel in but maybe I should be running the highest octane ? yes its not a Yaris ahhh sorry

Elantra N-Line?

I doubt you'd ever feel any difference. Have you emptied you catch can yet to see what's in it? I have the hardest time remembering to empty mine. I actually remembered last week. I have a ball valve drain on mine. I emptied what would be probably 1/8 of the full volume of the can. It looked like the typical chocolate milk color and stinky as usual. I probably had driven 1500 kms. Not a lot, but much better than having it sucked back into my manifold, weakening my effective octane rating.

I don't think you'll see any benefit to running higher octane (premium) gas. As far as I know, your engine is naturally aspirated with a compression ratio under 10:1.