I changed the oil on my 09 GW today, to Mobil 1 racing 4t and an OEM filter , (Made in Japan). From whatever Oil the factory installs when new.
And WOW, am I dreaming My Goldwing seems to have gained Horse Power, smooth, changes gears like a Lexus. I don't know what Mobil 1 puts in the Oil but I am impressed.
My GW will live it's life on Mobil 1 racing 4t. Thank you Mobil for making a product that is really worth the money.
No, I don't work for Mobil, in case you asked.