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One of my Guzzi owner's manuals recommends "Castrol Products"This is a favorite over on the Porsche forums and is available at many auto parts stores. I know of at least one Guzzi dealer that uses 10W-50 in their service area.Last time I changed mine, I was out of that 10W-60 stuff and had to use what was on the shelf. Genuine Harley Davidson 20W-50. It sure sounds a lot better now. Tomato tomato
Strongest? I would not have thought to use the adjective “strongest” with respect to motor oil. I wonder how compassionate this oil is and whether it is loyal. It probably is good oil, but Castrol’s marketing BS causes me not to buy it on principle.