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Change it occasionally and you will be fine with most any decent oil in the specified range.
I have my preferences and so do most others.
 

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Change it occasionally and you will be fine with most any decent oil in the specified range.
I have my preferences and so do most others.
Well this is my first time ever working on a motorcycle.. was sitting for over 20 years in my parents garage... Didn't run when I got it.. now it does... Needs a oil change just didn't know what type of oil to use... I got regular 10w40 from Napa... Just wanted to double check before I mess anything up..
 

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Our bikes have a wet clutch. Same oil, for motor and trans. Do some research, and learn why it makes a difference.
I use Rotella Diesel 15W-40, also. I noticed a difference, after recent oil change. I've only had my GL500I, for about a year. So, have no idea what PO was using. Or, how long since last change.

EJ
 

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You will be fine with what you bought.
There is a lot to learn about oil if you want to look it up on the WIKI, however.
 

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Seriously Slane, do a search. I am sure your oil is fine. But some of the discussions from the past can be pretty amusing.
 

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Some modern oil - regular, semi-synth or synthetic - contains friction modifiers which will wreck your wet clutch. I stick to oils that show a JASO MA rating, indicating that they're wet-clutch compatible. Around here at least there's a selection of JASO MA rated oils amongst the mineral, semi- and full-synth.

Plenty of non-JASO MA rated oils will work just fine (not everyone bothers to get that rating verified), but not all will. For what it's worth I stick to full synthetic 10w40 (suitable for my climate), as it works in the other bikes I work on too.
 

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Only energy conserving oils have friction modifiers and they're all going to be light weight oils.

I use Mobil 1 15-50 in just about everything....bikes, buggies, lawn mowers, windmill gearboxes...except my Ford Expedition.
 

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Well this is my first time ever working on a motorcycle.. was sitting for over 20 years in my parents garage... Didn't run when I got it.. now it does... Needs a oil change just didn't know what type of oil to use... I got regular 10w40 from Napa... Just wanted to double check before I mess anything up..
The worst you can do is run the bike with NO oil, how ever I use 10w.40 Valvoline 4 stroke for Motorcycles semi synthetic, the reason is that if we use full synthetic the clutch may slip as this stuff is too slippery for the wet clutch.
I hope this is helpful in your decision making. Cheers
 
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