How often should I replace my spark plugs? Is it a matter of routine maintenance, or does the frequency depend on specific driving conditions and car models? When contemplating the longevity of spark plugs, should one consider factors such as the type of plugs installed, whether they are standard copper, platinum, or iridium, and how that affects their expected lifespan? Furthermore, might driving habits play a pivotal role in determining the necessity for replacements? For instance, do those who engage in frequent short trips or experience extensive idling require more frequent changes than those who drive long distances on the highway? Additionally, could environmental factors, such as extreme temperatures or high humidity, exacerbate wear and tear? Ultimately, how can a vehicle owner ascertain the right moment for replacement without incurring unnecessary costs? Is it prudent to rely solely on manufacturer recommendations, or should one conduct regular inspections and keep a vigilant eye on performance?