I bought my z with exactly 15000K and told the previous owner that he had to foot the bill for the oil exchange. I told him to tell them at the dealership to put in the gt-r oil and not the z oil and I would pay the difference. At my dealership the oil for the gt-r is not the same as the Z. Does anyone know what the difference between the two oils is? I hope it's ok that I did this. My friend who has had a z for two years recommended this. Does the gt-r oil need to be replaced more frequently? Does it keep the engine in better condition or was it a waste of money?
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