Mazda's iconic Miata roadster is in the Guinness Book of World Records for being the best-selling convertible sports car of all time. Since its introduction in 1990, it has achieved a cult-like following, producing hundreds of Miata clubs across the world. The Miata has proved to be a reliable vehicle with excellent longevity; however, there are important requirements to follow in maintaining your Mazda Miata, to keep it running smoothly for a long time.
Many Miata owners are baffled when checking the required service intervals for their vehicle. A quick glance at the owner's manual will tell you that oil changes are required every 7,500 miles. In a perfect world every Miata owner would have their oil changed every 7,500 miles and experience no problems; however, when you read the fine print, you will discover this service interval suggestion assumes optimal driving conditions.
Most areas of the United States do not have climates that constitute optimal driving conditions, though. Extreme heat or cold, humidity, elevation or imperfect roads usually necessitate service intervals of every 3,000 miles, if possible. Dirty oil breaks down and makes lubricating internal engine components (oil's primary job) very difficult. Frequent oil changes are cheap insurance against future engine problems. This is especially important in a vehicle such as the Miata, because of its small, high-strung engine. Internal components can wear quickly if they are not properly lubricated.
Every Miata manufactured from 1990 to 1997 came with a plastic rear window in the convertible top. These are easily subject to damage from owners not unzipping the window prior to letting the top down. Letting the rear window down before taking the top down will maximize the lifespan of your convertible top. If the rear window is damaged, it cannot be replaced; the entire top would have to be replaced.
For owners of newer Miatas with glass windows, there are still some important steps to take. Keep the convertible top hardware (joints and brackets) lubricated to prevent premature wear. The hardware should be inspected and lubricated about once every 12 months.
Applying a protectant or conditioner to your vinyl top will extend its life, regardless of the model year. It is recommended to treat the top at least once every six months. The sun can cause extreme damage to the Miata's vinyl top, including shrinkage and dry rot, if not properly maintained.
Every Miata manufactured between 1990 and 2004 came with an engine timing belt. Newer models are equipped with no-maintenance timing chains. If your vehicle has a timing belt, it is of utmost importance to change it every 60,000 miles. A timing belt wears down as it ages and can break---leaving you stranded and unable to drive your vehicle.
Miatas manufactured since 1999 have required premium fuel. The compression ratio of these engines is very high---this requires premium fuel (91 octane or higher). Using a lower grade of fuel can harm your engine's emission components and severely decrease fuel economy and power output.
