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While there might still be the odd one in grey (they do occasionally appear in photos of captured vehicle parks among serried ranks of camouflaged vehicles), the VAST majority were painted dark yellow, with red-brown and olive-green camo applied with varying degrees of success. The Germans even camouflaged their horse-drawn carts...
Did they paint the horses in three tones camo too?
It is impossible to say with certainty what colour German vehicles were painted. A lot depends on which unit you are representing and the role of the vehicle.Generally by 1944 new vehicles were supplied dunkelgelb with olivgrun and rotbraun paint for camouflage. There was no set pattern or proportions so depending on how (if) the paint was thinned, how it was applied (thrown, broom, paintbrush, spraygun etc) the density of colour and proportions used would vary considerably. This book is very useful https://www.amazon.co.uk/D-Day-Berlin-Camouflage-Markings-1944-45/dp/185409212XOlder vehicles of the occupation army or those in anti-partisan, fortress, supply etc roles would only be repainted if at a major overhaul or when going into action.Dunkelgelb with olivgrun stripes and patches was very common in combat units - some also used the rotbraun instead of or as well as olivgrun.The older grey vehicles may be seen plain grey (particularly Kriegsmarine and Luftwaffe airfield vehicles, equipment, trailers guns) many were also given irregular stripes or patches of dunkelgelb, olivgrun or rotbraun or a combination.That said, my father was in Normandy from D-Day onwards and said that regardless of nationality all vehicles were of a similar dust colour within a few days of arrival.So I suppose that you are modelling a frontline vehicle so I'd go for dunkelgelb and olivgrun