I would sooner eat my own deep fried testicles than trust the 'tat' bazaar that is eBay to source the oil for any vehicle I own.
Most folk are bamboozled & overwhelmed by the technicalities of engine oil & it must be said that they wouldn't know a good engine oil from used chip fat.
If you have the time Google "John Rowland Silkolene fuchs" for all the info you could ever digest.
The man is a legend. There have been many times in motorsport when despite whose logo was on the bodywork this guys oil was in the engine.