Local Wal-Mart has Syntec 10w40 on clearance or $15.00 for 5 quarts. Is there any reason to not run this oil in a Honda GL1800? I know that Goldwing’s are not hard on oil.
I say do it. I run whatever synthetic oil is on sale. Always non energy conserving auto oil. I have never used motorcycle specific oils. I would run it for that price.