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I have a 1987 GL1200 Interstate and want to change the fork oil. I am trying to find out what type to use and whare to buy it. My manual tells me how much to put in but not what type.:?
 

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I use PJ1, 15 wt. I get it from the bike shop down the road, but a lot of guys use ATF fluid.
 

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really any good oil, the heavier the stiffer the ride but Jeff is right most use ATF or fork oil from a stealer.
 

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1993 gl1500, 1976 gl1000
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There usually is no way to determine what weight ATF is and it varies???. Bike fork oil ismarked on the container. I use 15#. But it is a personal preference. Also my fork seals stopped leaking when I switched over from ATF.
 

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Ignoramus Primus
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It is pretty straightforward really:


  • Motor oil for motors
  • ATF for Automatic Transmissions
  • Fork Oil for forks

    You could use any kind of hydraulic oil and be OK. Thats why some people use ATF and it works OKsince ATF is just a specialized hydraulic oil.

    Any motorcycle shop will carry fork oil. Usually you'll at least see 10w and 15w on the shelf.

    As a general rule the heavier YOU are the heavier the fork oil should be.
 
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