I always see lots of questions about how to change the oil on the Prius which is why I decided to post this. A lot of people assume that somehow it is more difficult or different because it is a hybrid, but the truth is that changing the engine oil is exactly the same as every single typical car. List of items required are 1. Oil Pan Bucket (you can also use a cat litter pan) 2. 14 MM Socket and ratchet (or wrench if you prefer) 3. 3.5 qts of a quality brand of 5W 30 oil (I like Mobil 1, Castrol, Havoline and Penzoil and I prefer synthetic, but it isnâ€™t required) 4. a new quality Filter (I like Purolator, Mobil, or the Toyota OEM filter) Other Items that may be useful 1. Oil Filter wrench (the ones with the rubber strap work the easiest for the Prius) 2. a rag to wipe your hands and cleanup 3. You may find it easier to pull out the jack and lift the car up a few extra inches. First if you have never changed the oil before identify the oil plug In the Picture above it is the bolt that is closest the wheel. Turn Counter Clockwise with a 14 MM socket after loosening that initial bit I like to replace my ratchet with an extender and loosen the rest of the way by hand, I find that it allows with a little care to remove the bolt without dropping it in the pan of dirty oil while also keeping your hands fairly clean. Also be careful not to lose the washer on the bolt. After the oil slows to just a drip you can now remove the filter. Turn counter clockwise. When loosened a little bit of oil will come down the side of the filter so have you pan in position. Depending on who put on the old filter it could be difficult to remove because of how small it is and the clearance around it where the oil filter wrench may come in handy, I had to get a screw driver and jab it through my factory filter. Also out of previous experience I make sure the rubber gasket on the old filter is still there I had one instance in the past but not with the Prius where the rubber gasket from the old filter stuck to the car and made for quite a mess when I started the car. When putting on the new filter I put just a drop of the old oil on my finger and rub it across the gasket as it helps seal from any leaks. And hand tighten until Snug DO NOT over tighten or use a wrench. Put the Drail Bolt back on Important: Remember to check to make sure the Washer is on the bolt, it will slowly drip if not. Pour in 3 quarts of oil, Then start the car for a minute to allow the filter to fill with oil, then shut off, since you need to wait about 5 minutes to allow the oil go back into the oil pan completely I find this to be a good time to dump the old oil into to a container. I save my windshield washer bottles for this purpose. Now pull the dipstick just to wipe clean then put back in and check the level (3qtâ€™s should put you about half way between the add and full marks, I would start by adding about another quarter of a quart and seeing where that takes it and leave just a fraction below the full line) Then take your used oil at your convenience back to the store, I know that both Autozone and Advance AutoParts take back the oil and I hear WalMart and most oil lube places will too.