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The 0W part is not going to matter because that is the weight of the oil when it's at 0C/32F the 20 weight part of the oil weight is the weight of the oil when it's at 100C and the question there is if the oil is thick enough for there to be correct oil pressure or is your oil thin enough that it flows to fast out of the bearings and you loose oil pressure, 2nd part of the problem is if the oil is thick enough that it is held back by the seals or if it's thin enough that it blows past seals and rings and you burn oil.
0W30 is thin when cold and the stock weight when warm and is listed as a legit replacement for 10W30 motor oil.
If your mechanic doesn't want to put that in, then change the oil your self.
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