We take delivery of our new GL39 Hybrid at Marina Portoroz in Slovenia in July this year. We plan to cruise the Adriatic and Med for a few years before repatriating it to Sydney Australia. I have a friend who is about to take ownership of a new Nordhavn 41 and he's "all over it". For instance, he has researched and then purchased a range of engine spares, including filters, impellers, belts, etc. I have a couple of questions. Firstly, are such measures considered typical for a GL hybrid cruising mainly coastal cruising, as there are essentially two modes of propulsion. And if so what range of spares might be considered. And second, is it possible to void warrantees by an (unlicensed) owner performing maintenance on the new diesel engine?