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As said a few pages back (by me) is that oil and chassis/engine condition impact a cars performance.I think you are right. I experienced similar differences from one of the r
Qualifying to another, after making some changes. I always thought it's just that I lost momentum or I'm just not as focused as before.
BoP is weight, power and sometimes chassis settings.
Worn oil and engine/chassis condition impact things like the speed of revs, the smoothness of the revving and max RPM.
These affect lap time optimums potentially.
I can feel when driving if the car has worn oil just by the hesitancy and smoothness when accelerating.
You can also see it when chasing ghosts.
Rent a cars don't suffer from this as they are reset every time you enter a session. There is a caveat in doing hugely extended sessions but that would be a rarity as most people won't do a few hundred miles in a single session.
I believe this is a nod to older GTs where an oil change on a used car gave you a few extra BHP and cleaning the car added money when you were selling it.
As with everything they have moved the concept on a little more and made it more complex now.
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