I don't know why, but I had this feeling that wear levels could be different for road and racing cars.
Well, it's not. 5.000 km is still the same distance to get to the first engine and chassi wear level:
R33 Chassi is still at "Excellent" condition because I bought a new chassi to get rid of weight mods a couple weeks ago.
I can confirm it's also 5000 km for the Chassi because I had an Evo V close to that distance and it did change. Coincidentally, I had to buy a new engine for the Evo to remove permanent engine upgrades, so engine it's still "Excellent", but Chassi is just Normal.
So basically, it's 5000 km for both engine and chassi. Buying a new engine/chassi at GT Auto resets the progress, although I think everyone knows that buying a new engine does not reset the mileage you have on any car.
Might be common knowledge at this point, but I did recorded my Vette oil condition after the first oil change:
Using the C7 since I've done something similar with the
GT3 Vette.
Excellent - I'd say it's ~250 km under this condition on avarage for most cars. It's not a fixed value. I know the road Porsche Cayman can go to 260 km and the Gr.3 Pegeout RCZ can reach 270 km. I've not seen any car that can maintain this level above 300km.
Normal - any impact on performance? YES. With oil still at Excellent, my times on Tokyo 600 were all between 26:56-26:58 minutes. At Normal, my times were between 27:01-27:05. For comparasion, my R33 can do 27:03-27:06 with Excellent oil, but goes to 27:06-27:09 with Normal oil. The difference between Excellent and Normal is subtle, but it's there.
Worn - this is the only difference between the road and the GT3 version. With the road Vette, I could do 714 km. With the Gr.3 Vette I could drive for 790 km before reaching the last stage. I'm ~3 seconds slower on Tokyo compared to the previous level.
Bad - well, it's bad!
Having bad oil on a road car isn't as awful as having bad oil on a Gr.3 car, but be a good responsible owner and don't let your car reach this stage! My times at this level were all above 26:12. Also, I cannot prove this, but I feel like the handling is being affected at this level. I swear the car is all over the place!
Some things are different from GT6, like oil wear values, others are still the same, like "maintaining a good oil status does not slow down or prevent the engine deterioration". You can read this
awesome post by Hastatus in the GT6 sub-forum.
One thing I'm really mad about it: there's no oil indicator on the dashboard! Either I'm blind or I'm not paying enough attention!