I could be all wrong here – but I’ve pretty much gone to braided stainless steel hose and AN fitting on everything. I have had hard metallic lines in brake and fuel applications and when they rust they are an absolute bugger to work on. It may be a bit more expensive, but it lasts forever and has no issues with vibration or stress. The rating is typically 500PSI plus and the operating temperature is -40 to 300 degrees F. The manufacturing process takes all liquids into account and most all of them have a statement similar to this:

“Stainless steel hose consists of a synthetic-nitrile inner tube with a partial stainless steel reinforcement inner braid. On top of that, we add a heavy-duty, protective, full stainless steel braid on the outside, making it exceptionally lightweight, flexible, and durable. Even better, our hose is designed to handle gasoline, oil, or coolant.”

Tight connections, lots of versatility, lasts a lifetime and looks great.

My two cents.
Glenn