I notice everything. I do have a very zen-like mechanical background. All my cars had oils they liked and disliked.
And, it had little to do with new vs old oil. Moly amount, viscosity, and type of oil were definitely noticeable.
Engine noise, harmonics, sounds, vibrations, MPG, HP, general all-around feeling.... were different among the oils.
My little lady responds the same way. She breaks down when I bring home shopping bags full of groceries. When I forget the supermarket trip and instead make reservations out, she runs so much better. But to me, its the same food.
And, it had little to do with new vs old oil. Moly amount, viscosity, and type of oil were definitely noticeable.
Engine noise, harmonics, sounds, vibrations, MPG, HP, general all-around feeling.... were different among the oils.
My little lady responds the same way. She breaks down when I bring home shopping bags full of groceries. When I forget the supermarket trip and instead make reservations out, she runs so much better. But to me, its the same food.