Faltering when accelerating gone
Now, this is just one day and the faults are intermittent but I tried everything I could to get the engine to misbehave such as stopping to let it cool down (guaranteed to stall after that) drove in 1st gear at 1200 rpm and then hit the accelerator pedal, no problem. Drove in cruise control at 40 mph and blipped the cruise control up 5 mph, no problem.
Basically, I am a happier but poorer man however the car is still going in to have the fuel regulator valve changed (under warranty) as this was seen as the culprit by Peugeot. Could be that the shell fuel has helped the fuel regulator valve to operate better. Could it be the fuel has better lubricity due to additives which brings us back to the OPs original question about 2 stroke oil
My problem with modern common rail engines is that they are impossible to work on which I find hard to accept keeping in mind I have worked on diesels over the years from Volvo 2 cylinder donkers through Ford and BMC to RR/Perkins V12 engines. As has been said, these older engines will run on anything including old socks but I think that the modern generation of engines are more “choosey”
When this tank of liquid gold has been drained, then we will fill up with standard Shell which at one of our garages, is the same price as the supermarket for about 2 day a week, howver the tank may take a while to drain as we returened about 7 MPG better than usual.