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Re: Do i need an oil change?
Oil does not go bad. Some of the additives may disperse over time, but that is not a big concern.
The real concern is the length of your weekly trips. Short trips are actually worse for oil than long ones. Short trips means the engine is cold. Short trips means a richer running engine, with more hydrocarbons, byproducts and condensation contaminating the oil.
Long trips(even once a week) means the oil gets hot and can 'boil-off' these contaminents, which keeps the oil working effectively.
So if you just have short trips since December, say 1/2 hour or less, then change the oil. If the trips have consistently been longer, say 45 min or more, then its less imperitive to change the oil. But new oil is pretty cheap, so if in doubt, change the oil and filter.
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