Eco mode does not impact the oil one bit, oil choice impacts LSPI event chance. Eco mode usually doesn't let the engine rev and keeps the engine in lower gears, where it is easier to be in LPSI range. The ECU tuning of the drive by wire throttle is not as sensitive to throttle blade increases on and keeps you in a low rpm where you have a better chance to lug the engine inside the LSPI rpm range. Getting out of Eco mode usually gives you a more progressive throttle input and I can assume a better ignition advancement to drive you through the LSPI range with little to no lugging.Have you found Eco mode to negatively impact oil, or the engine?
I had what aI feel was a LSPI event when I just bought my new car 2018 Hyundai Kona AWD with a 1.6T. Regular gas, OEM oil, in normal mode/Eco mode and that car gets to 17 psi/1.17 bar at 1,475 rpm when WHAM. The car felt like it jumped 5 feet in the air. I never thought I could get that much input into the chassis. It was like I drove straight into a high 90 degree curb at 20 mph. I knew what LSPI was and I thought, there goes my motor, she is toast. But it still ran and no weird noises like a bent rod or bearings. After that I only ran mid grade in the winter and premium in the hot summer. Today my car is a tuner car so, 93 only no matter what. You can see it in my signature link.