G-Oil is marketing eco-greenie.... truth is unknown! Marketing is meaningless.
All synthetics tend to be more biodegradable. My driveway spillage is proof of that, as you can't see ANY of the synth stains, but I can find and show you the mineral oil ones.
G-Oil is labelled a full synthetic. Whether you believe it to be 100% animal fat ester or not is irrelevant. I don't! I have a feeling that it is a GroupIII or IV, blended with the pork/beef/chicken ester, making it not much different then ANY other full synthetic oil blender using off the shelf additive package containing ester friction modifiers, seal conditioners, or VII/VMs.
I can add a couple ounces of Lubegard(LXE), Autorx(Lanolin), HyperLube(Jojoba), Wynn's +Supreme+(Jojoba), S9 Biotech(coconut)... and call my sump GREEN too! Peace brotha!
Between Valvoline NextGen and G-oil, I'd take a full synth 1st ALWAYS. G-oil wins!
Gotta go. Need to push the 'organic toxic chemicals' to the masses. How about organic hydrogenated oil? Please leave a stick of margarine outside and see how well it does biodegrading!
Marketing is meaningless.