From when do you think the care of the checkbook no longer pays? The warranty expires and I decided not to go to the dealer anymore, because the prices are beyond good and evil. I can change oil myself, spark plugs change as well. To the free workshop because of the stamp or simply keep the invoices of the material costs and make themselves (e.g. oil, filter etc.) ? Or rather to the HD dealer? how do you do this ? How important is a stamp in the check hef t. LG