QC is unlikely to be as rigorous in smaller companies as is the blending technology / equipment. claims for damage would be very hard to substantiate & massive hassle. WHY risk it for a few ££?
Interesting point. My car use to have Castrol oil, however I managed to buy the same spec from Asda's for 7.50 reduced from 20 as they were discontinued. The other day I purchased 10L of QX oil for same car for 13 for 5 litres. All meet ford specification. I do not think i am risking anything.
However for my bike i have used Motul oil as a replacement to BMWs recommendation.
I think it comes down to that my bike is my pride and joy. My car just a tool. The real question I ask myself is would I purchase westway instead of motul? To be perfectly honest I am not sure..
But I might