If it works, it’s never dumb. It would be nice to do all hard lines but I’m concerned about 2 things.
1) the stresses from vibrations and heat expansion.
2) there Is no phenolic break between each banjo fitting so the entire thing from turbo to turbo to block will transfer heat, both end to end and through to the oil over the whole run. My concern is that the oil in my feed lines will be more likely to coke and block the line/s.
Maybe I could do all in hard line with a short break in the middle. I can connect the hard ends with a short piece of Teflon flex to allow the system to deal with the stresses of vibration and heat expansion. Maybe I could dig up some fire sleeve (silicone coated insulation) to help with the heat transfer to the oil. I worry that the fire sleeve will (once heat soaked) actually trap heat in instead of out, making the coking potentially worse.
Thoughts on insulating hard lines at least right next to the turbo & DPF? Maybe a heat sink for the lines is a better plan?

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- Tom
‘10 E70 diesel, hud, hot/cold weather, 3rd row.