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I don't think I would use the nylon one. I just wouldn't trust it. I definitely would not use a copper one. There is a high potential for galvanic corrosion between aluminum and copper.
Thank you for replying Sabre-t, you represent the best part of this forum, your insight on using copper is brilliant and you were correct about not using nylon washers. Before I read your advise I went ahead and did the oil change with the nylon washers. Afterwards I parked my bike and within two days I found an oil drip on the floor. I then spent about $17 for a package of 100 - 12mm crush washers from Amazon and replaced the nylon washers. I now have enough crush washers to do oil changes for three life-times and an education to last me thru this one.
I hope this thread can help someone else down the road.
 

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Well, of all the contradictory arguments these "Super Mechanics" were pushing about "you don't need no stinking washers" or "Torque wrenches are for sissy's" crap was unsuccessful, and if "Galvanic Corrosion" is what finally convinced you to replace the damn things with the proper crush washers - great. (Only on an online forum!)
 

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I bought my 08' Classic LT in March of 2010 and the dealer included the first 600 mile service which came in about mid-June. I've changed the oil every year, close to the same time so that makes eight and soon to be nine oil changes so far (it only has 8K miles) and I've never changed the crush washer, then again I don't go HE-MAN on it when tightening it either and it's never leaked. The black rubber O-ring on the other plug hasn't been changed either but it has developed a leak to the tune of a drop or two per week. I guess Kawasaki wanted it to emulate a heritage soft tail enough that it needs to leak just a little.
 

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Well, of all the contradictory arguments these "Super Mechanics" were pushing about "you don't need no stinking washers" or "Torque wrenches are for sissy's" crap was unsuccessful, and if "Galvanic Corrosion" is what finally convinced you to replace the damn things with the proper crush washers - great. (Only on an online forum!)
Man, I knew you were butt hurt over this topic but it's even worse than I imagined.
 

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I change my oil twice a year. 40 bucks. I went to the dealer and picked up 6 crush washers for about 5 bucks. Some reuse them I figure that cheap what the hell.
 

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BTW, what is the I.D. of the aluminum crush washer needed?
My 1700 Voyager takes 2 #92065-097. As far as your Heritage leaking oil: My Harley Heritage has never leaked a drop of oil.
The only bikes I've owned that leaked oil were: a 1998 Suzuki LS650 Savage, a 1996 Suzuki LS650 Savage, and a 1896 XV1100 Yamaha Virago.
I will admit, I never owned any Shovel Head, Knucklehead, or Pan Head Harleys. The Harleys I've owned were either Evolution, Revolution (vrod), or Twin Cam, but none of them ever leaked one drop of oil! (I've owned 11 Harleys)
No Kawasaki (6) or Honda (9), Yamaha XV1700 Road Star Warrior, or Suzuki Boulevard C-50 (2), I have owned has ever leaked oil, either.
 

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If this has been answered already sorry. Long thread. I just did the oil change and replaced the washer and o rings. I just looked it up in the manual. There are three holes. Two o rings and the crush washer. Get them from a bike shop or even Ebay there cheap. I got like 3 of each cost was like $8 or so. Beats having a oil leak and doing it all over again. Ride safe!
 
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