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I don't see the problem then. If you are worried about attaining perfect conditions, why not just change the oil and be through with it?For time-trialing you always need perfect conditions and same conditions for everyone..
I'd imagine that 95% of returning GT players automatically change the oil on all cars that they receive anyways, so one could reasonably assume that the people who put enough effort into being at the top of the leaderboards already changed the oil.