Sweating hoses

The very best coolant hose (heater & radiator) is silicone. Price it (ebay) and you will decide to use metal tube for most of the heater run, as most newish cars do, plus tube is lighter. I am slowly switching all my cars to Evan's Waterless Coolant (no corrosion), so will see if any stranger effects. I sure want the best hoses so I don't lose that expensive fluid.

Most new cars use nylon hose for fuel. Even my 80's M-B diesels use it. I think it is more impervious to the nasties they put in fuel today, though it does develop cracks and leak. I don't know if the cracks are from chemicals or vibration. You can buy it for retrofit at Autozone, etc, but pricey so again use as much metal tube as you can. EFI hose is the only one I would use, despite the higher cost. I am cheap, but not stupid cheap. I have bought some of these materials fairly cheap on ebay by getting new production tubing for certain cars and modding to my needs. Often cheaper than raw nylon tubing, plus you get fittings and bends.