larrydr Posted July 22, 2021 #1 Posted July 22, 2021 About 3 months ago I repaired both forks on my 83 1200 On oil refill I used a synthetic blend oil by Torco I noticed a leak on one fork about 4 days ago , and I drained the oil and it came out black and ugly I have flushed the fork 4 times now and will flush it again on July 22 . The bike has not been run for at least 3 months and I don't understand why the oil would turn black with the bike sitting Have heard some comments about the seals not being compatible with synthetic blend oil I hope some can explain why the oil would turn to a dark black
WildBill1 Posted July 22, 2021 #2 Posted July 22, 2021 Ford transmission fluid works for me its good on the seals. 1
sldunker Posted July 23, 2021 #3 Posted July 23, 2021 My guess would be one of the additives in the oil don't like your forks. I have seen this before but don't remember what fork oil it was. Use a name brand oil and see what happens.
saddlebum Posted July 23, 2021 #4 Posted July 23, 2021 (edited) I have always used Bel-Ray fork oil Edited July 23, 2021 by saddlebum 1
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