By NOT changing your vehicle's oil on a regular basis, you risk damage to your engine, transmission and other moving parts of your vehicle. Your engine is made up of small components that require oil to lubricate them and keep them from rubbing against each other. When the oil eventually becomes dirty and thin over time, these moving parts could become damaged. This in turn may cause major damage to your engine.
You don't have to have another ojl change to get your car washed. You can just pay for a car wash
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