[vtwinsport]

Sorry to hear that.
If I believe what the speed shop told me up here, its definitely the heads you'll be needing to replace to fix that. I also get ash deposits on the #5 and #6 plugs every 2 months and I add a quart of oil about every 800 miles.
If I do a 1-2 hour trip on the hwy at 60 mph- it will need 2 quarts after 2 hours. I' not burning any blue, just grey when I let off the gas and the engine vaccum sucks oil past the seals.