I very common question and if you use the search tool at the top and type in "what oil', there will be material to keep you up for nights on end.
I think you are making the best choice until you decide differently in the future, if ever.
I use amsoil in all my vehicles. I am no expert in dino vs. synthetics, and have no dog in this fight. It will eventually come back as a question to you -what do you want and you have already expressed it.
The factors that made me go synthetic are:
1-I am very busy, this is easy for me to do once a year as all my vehicles get about 10 to 12k / year on them. I change all the filters in the spring and all the oil in all vehicles in October.
2-my bike is 16 years old and the number of times I have to tighten a steel bolt into an aluminum bike is a risk. The more I do it, the more I risk creating a "BIG' problem. (a pet peeve of mine and not intended to be transfered to you). I use a torque wrench but have had 1 fail me at work in the last 5 years. They are great tools and I use them regliously still today but I am now more careful and pay better attention now that it happened once.
You can't go wrong using HOnda oil. I am always impressed with Honda's engineering team that designed and executed a gl1500. I imagine that same quality is built into the newer models.
Happy reading. Unless you go outside common, proven and approved advise, you won't be wrong.
If you ride a lot and don't want to change oil every month than go to synthetic, other wise use Honda oil. If you want to use synthetic go to WalMart and get shell Rotella T6, full synthetic and about $25.00 a gallon. I used Rotella in my 02 but always used Honda oil in my 08. As long as you change it regularly you won't have a problem no matter what oil you use. When was the last time you heard about a Gold Wind having an oil related problem?
Just found Mobil 1 RT "Racing" 10-40 full synthetic at a local auto supply. This is a specially formulated oil for motorcycles that have a wet clutch...like my Honda Goldwing. I always wondered why it seemed as though my clutch was slipping years ago when I used Castrol GTX full synthetic. Well it you find the black circle on the back of the bottle and see any words to the effect, "friction reducing" then it is not made for a wet clutch. Beyond that there is a significant body of evidence that synthetic oil is better in places like Texas where heat is far more likely than cold. At the end of the day...it is a gamble. I bet on a $10 a quart of synthetic oil against any OEM. but that is me. RIDE SAFE!
I ride a lot I had over ten thousand mile in nine months this year before i had to stop ride for surgery,and I don't like paying $90.00 and my dealer so i figure I would start changing my own.
I change my oil every 3-4 thousand mile and already have changed it three times this year so I'm looking forward to wrenching my own wing for a change.
I've been using Rotella T for about 90,000 miles, Change it every 3,000 to 4,000 miles unless I'm on a trip. The wing has 174,000 and change on it and sounds like the day I bought in Aug, of 93.
Much can be said for most name brand oils, pick one you like and change it regularly.
From the Northwest Corner
I change my oil and rear diff at the same time each time along with a fresh OEM filter and crush washers. Gives me the "warm & fuzzies".
The Honda GT4 oil is a quality lubricant as well.
As long as you change the oil at the prescribed intervals using quality components, you're Wing will last a L-O-N-G time.
One of the 1st things I bought for my Wing was a shop manual for approx. $65. Best investment I've made other than perusing the boards for suggestions from those members whom regularly give good advise and are kind enough to share their experience and expertise.
I do all my own repairs and installs but knowing my limitations is sound judgement. Sound judgement includes not having the right or specific tool for the job I want to undertake...hint, hint.
My 98 has 220,000 and runs like a scalded cat. Took it to Chicago recently towing the Wing and got 17mpg, otherwise averages 19. It's my daily driver work truck and probably won't buy another diesel truck. Getting this one re-painted and doing some restoration to make it look new. After 2 new Duramax trucks at nearly 50k, I decided to bail out of big truck payments and terrible depreciation. I'm happier now having all my chit paid for.