What sort of 'problems' are we talking about here? I've occasionally left my 4/4 standing for a few months and all I do is start it up, take it for a good thrash to get everything nice and hot, and then fill it up as normal. The only issue I've ever noticed if it can be called that is that it takes a few extra seconds cranking on the starter to get it fired up, which is in my view a good thing as it gets the oil circulating round the engine.

Tim H.
1986 4/4 VVTi Sport, 2002 LR Defender, 2022 Mini Cooper SE