Well the engineers from Yamaha did quite a lot of mistakes on the 1VJ. The air intake just over the engine which is 10-15°C more than outside temperature, and the oil cooler is fitted in a bad location. The right fork tube will deviate most of the air from the cooler, making it probably less efficient than on the older 34 tenere.
If you look at the XT600 47N and the TT600, they don't have the oil cooler. So there are good reason to ask yourself if they are really needed, especially if you drive in europe where the temperature is not too high.
I believe than DL knows what he does.
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