It's highly unlikely this is related, however... Back in my German auto parts days, when synths started showing up on the scene, a lot of guys with older, high mileage cars, thinks 70s and 80s Porsches and BMWs, started having problems with leaking seals, where they had none before. It was determined the smaller molecules of the synths would make their way past the tired seals, so we began recommending they stick with conventional dino oil and the problems resolved themselves. I can't imagine anyone in this day and age would use materials that would be susceptible to this, but then again, Enfield is an Indian company known for making low cost bikes, so who knows if they cut corners on some of the materials. IDK... Just throwing that out there.