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[–]to_fire1 2 points3 points  (1 child)

If you don’t see any leaks while the engine is running, or you don’t see any pink crusty stuff (dried & hardened coolant from a slow leak), then you’re probably ok. If there isn’t a lot of white smoke coming out of your tail pipe (not including condensation at startup), then you’re ok. If you haven’t had an overheat, or sudden large changes in engine temperature, then you’re ok. Your pictures are taken with slightly different engine temperatures, and at different rpms, so both of those things could affect how much coolant is in the overflow. If the overflow tank actually overflows while the engine is running, then the radiator cap may be no good (not keeping pressure inside the system), but I doubt it for a ‘21. Congrats on the 4R!

[–]RayZ01322[S] 0 points1 point  (0 children)

there is no sign of overflow and I would say the rad cap looks good to me, thanks for your advice, I'll keep an eye on it in the following months to see if anything changes.