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we can tell you what brand we use, me 10w40 castrol for motorcycles. but best brand i cannot answer
 

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When I had a 74 Yamaha TX500 I used Castrol as well. When I went to touring bikes I used Golden Spectro in my 86 Kawaski Voyager and Honda synthetic blend in my 1998 GL1500 and now in my 2009 GL1800. Goldwing engines are pretty forgiving, so any brand oil that meets motorcycle specifications should work. I also change the filter with every oil change. Ride safe.
 

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I have used Castrol GTX for years with no ill effects. Was told recently that this may not be a good idea so sent Castrol an email to see if GTX meets the JASO-MA spec. This is my second gl1100 and have been told that oils have changed, will see what Castrol says and if its bad will let you know Nick
I see this is your first post. Welcome to the forum from Pennsylvania. Where do you call home. Enjoy the forum and ride safe..
 

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LiquiMoly is the best oil that can be used in gasoline and modern diesel engines. None of the others and even that purple crap can come close to it. They have full synthetic but their part synthetic(10W-40) is the way to go. I have been using it for more than a year and it did nothing to the wet clutch.
NAPA Auto Part has the best price, somewhere around $25 for a 5L bottle.

Here's the link for some of you who don't have NAPA Auto Parts close by:
http://www.autosportcatalog.com/ind...-14AE-DE11-93DB-0019B9C043EB&mr:referralID=NA
 

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That's a pretty bold statement to make "LiquiMoly is the best oil that can be used in gasoline and modern diesel engines. " all oil companies spend a fortune on research and I really doubt anyone can make such a definative statement. My father in law worked in the oil industry for 40+ years and he could not make such a statement and he was in charge of the Motor vehicle engine oil research labs for France petroleum. I don't doubt liquimoly is a good oil, but the best!!:rolleyes: Ultimately any oil that meets honda standards will be a good oil, just stick with the more well known brands for added security..
 

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Ultimately any oil that meets honda standards will be a good oil, just stick with the more well known brands for added security..
Just to set the facts straight, I am not associated with LiquiMoly and gain nothing by endorsing their product. You can use any, as you call it
"well known" brand. Well known becomes because that's what you see on the shelves and what the US manufactures are pushing on you.

Go Mercedes, BMW, or Porsche service dept. and talk to their senior mechanics, or better yet, an independent service that strictly works on German vehicles and see what they have to say. And by the way, 40+ years of being in charge of oil research is totally irrelevant. Being so cheap, French were probably trying to convert their french fries oil for other uses.:D
 

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For the past several years I have used the Shell Rotunda 15 w 40. I think its called Rotunda , could be wrong on that. --------
It is actually Shell Rotella T 15w40 for diesel engines, and this oil does meet the JASO-MA spec. for use in motorcycles with wet clutches. I used this oil in my Kawasaki Voyager XII, as it is highly recommended for this bike by many, many members of the American Voyager Association.

I now continue to use this in my 2003 Goldwing. It is available at my local Wally World and Meijer for around $13 a gallon. The bike is completely happy with this oil, no ill effects.

Actually my friends Harley Tri-Glide manual says to use Screaming Eagle oil, but if not available use a good Diesel oil.
 
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