The oil analysis companies can't tell me what oil I give them unless I tell them first. Even when I send them 10 replicates of the same oil in one go.
Sure, they can measure viscosity, additive package and a whole bunch of other things, however viscosity changes as the oil breaks down, and many oils will have similar viscosity and chemistry.
If you use an oil that is chemically and tribologically similar to the OE spec then I doubt LR could tell without spending tens of thousands on analysis.
However for the sake of peace of mind, it makes sense to use the OE spec oil. An oil of equivalent quality will cost as much. And WA isn't significantly hotter than the east coast on average.
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