By your interpretation (below), then there are free radicals in the synthetic fuel allowing oxidation to occur? I do not think so. Silly that you are comparing BIOFUELS, which have this problem, to plastic to oil/fuels.
"The biggest issue that still needs addressed is the problem with oxidation of synthetic fuel. Just because its in spec doesn’t mean that it’s saturated. When you crack plastic you are breaking the molecular chains, which means that you are missing a hydrogen atom. This makes it prone to oxidation and renders it bad within days of being made."
Biodiesel Stabilizer Description:
This oxidative stabilizer from Springboard Biodiesel is a fuel additive designed specifically for Biodiesel to help prevent Biodiesel from oxidizing. When used properly, it will increase Biodiesel's resistance to oxidation which can greatly extend the shelf life of the fuel. It's also been specially formulated with additional additives to help eradicate microbial growth as well.
When used in conjuction with Biodiesel made from waste vegetable oil, it can greatly increase the chances of the fuel passing the ASTM test for oxidative stability in the Biodiesel ASTM Standard (ASTM D4625).
Also Works With Vegetable Oil!
Because the oxidation process in Biodiesel is the exact same as vegetable oil (breaking down of the fatty acid chains), the Springboard Oxidative Stabilizer will help preserve new and used vegetable oil as well!
In tests performed by Springboard Biodiesel, it was found that fuel treated with the oxidative stabilizer performed significantly better in Rancimat testing, which is how Biodiesel is tested in the ASTM Standard for oxidative stability.