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5000 miles on engine oil. I had a used oil analysis done on the v-twin 20w-50.
I sent the sample to blackstone at 5000 miles on the oil and the additive package was still viable and TBN was over 4.
Blackstones comments were that I could still run the oil for another 1000 miles easily.
This uoa was done on a 96 ci engine with pipes,fuel pak and breather.
Amsoil will go an easy 5000 miles but it's best to get a few uoa done so you can customize a maintenance schedule for your particular bike.
Ive used Amsoil, Syn3, Mobil1 & Redline Synth - prefer M1
Oil change with filter around 5000 miles, sometimes less & sometimes more....
Unless your sitting in traffic idling alot, I dont see a need of doing it earlier
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