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OEM spark plugs are those that are manufactured by the same company that produced your vehicle. They are designed to meet the specific performance standards and requirements set by the original manufacturer. This means that using OEM spark plugs can help ensure that you are getting the exact component that your vehicle was engineered to use, potentially resulting in better performance and efficiency.

It is vital for engineers and designers to consider the manufacturing limits of their specific die casting process when determining the optimal draft angle. Some materials, like aluminum and zinc, are more forgiving when it comes to draft angle requirements, while others may necessitate stricter adherence to drafting.