The Oil Change message can NOT be reset until it appears. So if you change the oil early, before the message pops up, you can't reset it at the time of the oil change. (Perhaps the Dealer Scan tool is capable of resetting the oil change required warning before it actually goes off, if you bought the Commander at a Dodge/Chrysler/Jeep Dealership, bad on them).
The earlier Commanders, its "thought" the oil change warning is purely mileage based. The later Commanders, its "thought" to be usage based, i.e. the mileage between the light going off will depend on how, conditions you drive the vehicle.
I don't trust dealer's, it would NOT surprise me in the least if they lied and said they changed the oil and never did it. Check the oil and look at it on the dipstick, wipe the dipstick with a clean rag and look at the stain on the clean rag, if the oil is dirty I doubt its only been used 300miles, if the oil is fairly clean, then I would guess the Dealership just did NOT reset the warning light. If you purchased from other than Dodge/Chrysler/Jeep Dealer, likely thy could NOT reset the warning message until it actually appeared.
To reset the Oil Change Required message, turn the key to on (don't start the motor) and press the gas pedal fully down and let it fully up 3 times in a row within 3 seconds. The Oil Change Required message will change to Oil Change Reset message and go out. It should NOT come back until you need an oil change again, roughly 7500 miles, if you use the vehicle more severe (and short trips is severe) it may come on again earlier than that.
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