There is no good time to refill the oil. There is only a good time to replace the oil, involving draining the old leftover oil out before adding any new. This also requires replacing the oil filter and typically the drain plug washer (although these can typically be reused several times). Do it every 3k miles for conventional or 5k miles for synthetic. Check the dipstick every once in a while to make sure you aren't running low.

Many cars require the engine to have been stopped for at least 5 minutes before the oil level can be checked properly and accurately. You should though check with the owners manual to find the correct time specified by the manufacturer of the car as it can vary.

Nearly all, but not quite all, cars need an oil and filter change every 12 months as an absolute minimum and often sooner if the miles specified, again by the manufacturer, between changes have been attained.

The BEST time to refill your car's oil is when you discover that your oil level is below the add mark on your oil dipstick. You should be checking your oil level at a reasonably steady interval. I make it a habit to check my car's fluid levels every second time I stop to fill the gas tank.

Refill once it starts to go under the half mark between minimum and full

the oil is the blood of your car.

you want to change it once it has been used too long, usually it is between 3,000-6,000 miles or roughly 3 months. and don't forget about the oil filter as well.

what do you mean refill . you change the oil every 3000 miles If you use full synthetic 7500.Failure to keep your car on a maintenance schedule. will mean you shall ruin your engine.period. best time .you create the schedule. if your asking this question, chance are its past due , I,d change it this wknd if i was you.shop around for the best deal.

After 7:00 pm

If you are talking adding oil, then I like to check it before it starts the first time for the day, that way you get an accurate reading on the dipstick. Make sure its parked level.

After 6:00Pm

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7 am.

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The best time to change the oil is when it is down a quart. Rather than adding just the quart, just change the whole thing.

After 6:00Pm

When the engine is cold to check the oil level correctly.

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7 am.

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When the engine is off, pull the yellow crankcase dip-stick to see if the motor needs more oil.