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Surprised you didnt think anything of all the dash lights on when it was in 4?
It is in the FJC manual as well. I just read it last night.^^This was actually on Toyota manuals in old Land Cruisers and Hilux's. They recommended locking the hubs and using the vehicle in H4 for 16km (10 miles) every month to keep everything well lubricated and what not. We still have that mentality with the newer vehicles.