Originally Posted by WoREoD
I use Momentum all the time because I don't trust Shell formulations. I can remember at least two occasions in the last forty years when their premium product has been proved to caused significant damage to engines and compensation has had to be paid out.
But then I'm old and have a long memory.... (not so much short memory though)
The only event I can recall is the Formula Shell issues of the '80s.
High sulphur additives removed carbonised deposits off valves and valve seats of Vauxhall engines in only Denmark, Norway, Malaysia and the UK strangely.
Took them a year to work out it was this doing the damage.
What was the other time?