Here are the Oil Rules:
Use good oil.
Don't mix different brands of oil.
Don't add oil that's different from what is already in the motor.
If you must add oil and don't know what the motor has in it, either change the oil (and make note of what you put in) or add a non-detergent.
Once you add non-detergent you should change the oil as soon as possible.
If you're changing the oil, the 10W-40 you mention will be fine.
lp
U should always put in what the car calls for.
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