Yup, anywhere that coolant flows, I'm going to replace with OEM rubber hoses, but only when the originals fail.

Should I take a "if it's not broke don't fix it" approach to the rest of the engine bay? I don't have a garage, and have to rent space to DIY. I want to maximize my productivity while I'm in the bay I'm paying for. I'm not stranger to working on my own cars, but I also don't want to waste time on things that don't need to be addressed right now. my PPI said I needed to address the leaky valve cover gaskets. but that was pretty much it.