Join Date: Jun 2008
Location: Lethbridge Alberta
Model: 1999 GL1500 SE 50th Annv.
Until you become more knowledgeable I would stick with a 10-40 motorcycle oil and the Honda Antifreeze. That's what these bikes came out with.
One can always experiment with oil at a later date. A lot of hipe on types of oil but you can't go wrong with following manufacture's recommendations.
1983 GL1100, 2013 Suzuki Vstrom DL650
Previous bikes - 1971 BMW R75, 2008 HD Softail, 2000 BMW R1100R, 1980 XJ650, XT500, GS550, 77 GL1000 x2 and a few others