Have you ever thought of implementing an “Oil” System?
Like having different types of engine lubrication, and lubrication systems like dry sump lubrication or the standart type with one big oil pan and a Pump?
I mean, if you are aiming for 10.000rpm you will need a complete different lubrication System than you need it for RPMs in the range of 5000-6000.
Also it might be clever to choose the Oil quality, exactly like the Gas quality, because the Oil quality has a huge effect on the Engine lifespan, espacially in the higher RPM regions.
Maybe you can think about my idea.
And if you need someone who translates your game from English to German, I would do it
Keep on going
Greetings from Germany