I'm going to get to try two different oils in my car in the course of the next couple of weeks. Tomorrow, I'm having an EDT treatment and that garage use Mobil 1 ESP 5w30.
In a couple of weeks time, the car is going in to Audi for a service and they're going to use Shell Helix 0w40. They tell me the thinner oil works better in performance cars, so it'll be interesting to see.
I have a feeling I won't be able to tell the difference. Modern cars run so well in such a variety of different conditions, my guess is they feel the same from the driver's seat.
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