Here is some guidance on door hinge maintenance.

Nico supply a wide variety of door hinges which have different lubrication requirements. Details of specific product requirements are available on individual product pages. Hinges will also require occasional periodic lubrication as appropriate, and at least once every 25,000 cycles.

Please Note: LOADPRO Door Hinges are maintenance free and do not require lubrication.

D189 Door Hinge Maintenance