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The engine oil should be changed every 3000-5000 miles
Every 300 hours.
Gear oil should be changed every 4,000 to 5,000 miles. Motor oil should be changed every 3,000 miles to keep the engine running clean.
Should last the life of the engine and is normally changed during an overhaul.
Every 250 hours.
6 months or 3,000 miles. Whichever comes first.
Heater plugs in a ford focus 1.8 engine should be changed every 18 months-2 years.
3 hours
Should be changed every 60,000 miles. This is NOT an interference engine.
Must be changed every 105,000 miles. Also replaced the water pump at the same time. Warning: This is an interference engine. Severe engine damage will occur if the belt breaks.
it turns brown when it is burnt, hasn't been changed often enough, you can replace it and you should be find
If the engine has a timing belt, it should be changed around the 150K mark. If there is a timing chain, it does not have to be changed unless it is damaged.