Capacitor selection involves a lot more engineering than just voltage and capacitance. Your plan could make the circuit worse instead of better.
High value ceramic caps are fragile, and have a dangerous failure mode in automotive applications: When they crack, they tend to become a low-value resistor. An automotive power system can supply high currents into this low resistance, dissipating enough power to start a fire. You can get special "automotive" capacitors, but inside they are just two capacitors (of twice the capacitance) in series, so that both have to fail before the fire starts. I expect you will find better cost and availability to just put two in series in your circuit.
High value ceramic caps are fragile. Some manufacturers only recommend placement with reflow, not with a iron that heats each end individually. Don't expect great reliability if you hand-solder the caps in there.
I would think high-temperature electrolytic capacitors should last the life of the vehicle. Replace, if you have to, with good-quality ones. But the designers of the ECU were designing it to last and you can assume they chose the capacitors wisely.