If you're asking if driving at 90 miles per hour is bad for your car, the answer is yes. Here's why:
At high speeds, your engine has to work harder to maintain momentum. This puts extra strain on all of its components, from the pistons to the crankshaft to the bearings. The faster you go, the hotter your engine gets, which can lead to premature wear and tear.
Your tires are also under increased stress at high speeds. The centrifugal force caused by all that spinning can cause them to overheat and wear down prematurely. And if you hit a pothole or piece of debris while driving fast, you're more likely to damage your tires or even lose control of your car entirely.
Of course, there's also the risk of getting pulled over or causing an accident when you drive too fast. Speeding tickets are costly, and accidents can be even worse. So not only is driving 90 mph bad for your car - it's also bad for your wallet and your safety.