Well Iv'e read all the advice/argument/discussion.
And I hope all on here realise what a cracking site this can be even though we can't always agree.
Many on here are the "Ole Timers" (Like Me)
And have done most of my servicing repairs myself for many years. (Although not many repairs on the two Sirions I have owned as they just run and run with just basic replacements as you would expect)
Iv'e enjoyed this debate although I only read it and didn't get involved this time.
So it is clear that we will never come to a full concensus on what oil to use in what vehicle.
Or how the various types are made
So use what you feel is good for your vehicle and be happy with that.
For me that will be a Fully Synthetic 5/40.
It has been for many years in many types of cars including two Turbo Diesels with High Mileage.
Never had a problem.
Any one out there can get me some rear springs for a Rally 4 ??
Regards, Bob F.