There are hoses, gaskets amd water pump which cause leaking. Check it out where the coolant is comming from.. The speed sensor is probablu bad.
The coolant in a 1998 model has dex cool antifreeze. It is red in color and not green. It is suppose to be good for 5 years or 150000 miles.
well since i am sure that you didn't catch the problem as soon as it happened. you were probably driving it before with coolant in the oil. just check your fluids and make sure you have plenty of both of them. i don't think that another 20 miles would hurt it.
If you are in the United States you cannot change the speedometer on the Mazda 3 from miles to kilometers. The only option available is miles.
chk coolant, chk coolant hose to turbo if it's a turbo. my hose was leaking causing overheating. My 2006 had a clogged heater core causing flow problems. Also the cooling fan is known to fail after 100k miles.
what you see when you look at the speedometer is the average distance you have traveled. notice the speedometer says mph Miles Per Hour how many miles you have traveled per hour.
Then it is time to get it fixed.
Speedometer measure thing in mph (Miles Per Hour) or kph (Kilometers Per Hour).
km/h or miles per hour
A speedometer measures the speed a vehicle is traveling in miles per hour (MPG) or kilometers per hour (KPH).
If the speedometer breaks, it effects the odometer. Check the speedometer cable it may be broken, even under the insulation.
its the PCV valve
The odometer is separate from the speedometer. The odometer counts how many miles you have driven total, while the speedometer shows how many miles you will travel in an hour if you maintain a given speed. You should immediately take you vehicle to a qualified service technician, and get the odometer fixed.