Are they anygood? that includes Syn

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2007 Black Pearl Street Glide
V&H true duals
Rush Slipons
SERT
Stage 1
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Previous Bike:

2001 Pearl White Fatboy
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2005 Blue/White Deluxe - Wife's Bike

Castrol oils are mostly automotive. Much better oils for the $$ for an air cooled engine.

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06 FXDLI

Life is like a box of chocolates...you never know which one is filled with $hit....

Castrol has a couple 20W-50 oils for the bikes. Here is AMSOIL's motorcycle study and they were both included.
http://www.amsoil.com/lit/g2156.pdf

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2007 Fat Boy

Pretty clear here that Mobil1vtwin or Amsoil MCV is about the best for the $$ Castrol ranked the worst according to this study. What would bother me here is that the Castrol sheared out of grade very quickly which means you buy a 50w oil and after 1000 miles it is now a 40w add some heat in parade mode and maybe you have a 30w protecting your engine. The TBN numbers were also the lowest which is an indicator that the additive package is very weak when it comes to protecting your engine against fuel dilution and corrosion.

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06 FXDLI

Life is like a box of chocolates...you never know which one is filled with $hit....