No, it is not necessarily rude to not use an oil change place for car repair. Car owners have the right to choose where they want to get their car serviced and repaired. There are various options available for car maintenance, including dealership service centers, independent mechanics, and specialized oil change places.
Choosing to take your car to a different mechanic or service center may be driven by several factors, such as price, convenience, trust in the mechanic's expertise, or a pre-existing relationship with a particular service provider. As long as you are respectful and considerate when interacting with any service provider, it is entirely acceptable to make decisions based on your preferences and needs.
When it comes to car maintenance, the most important thing is to ensure that the work is done professionally and effectively. Whether you use an oil change place or another service center, what matters is that you are satisfied with the quality of service and feel confident that your car is in good hands. Always be courteous and communicate your expectations clearly to any service provider you choose to work with.