I'm just wondering about using Royal Purple 20w50 for the engine on my HD. I was planning on using Amsoil but a friend gave me 4 qts of the RP motorcycle 20w50. I haven't come across any forum comments or topics on Royal Purple so I was curious as to the quality. Thanks for any and all opinions on this.
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2008 GMC Sierra 4.8 4x4 Amsoil OE5w30
2006 Honda Accord 4dr Auto Amsoil SS0w20
2010 Harley Streetglide Amsoil MCV20w50
2011 Kawasaki Kx250f Amsoil MCF