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 Changing your own oil is a fairly simple task, as long as you are armed with the tools and knowledge to attack it properly, it should not take you more than a half hour.  And that is where we come in, Saving you time and money that you would otherwise be spending at the shop. Changing your oil regularly is crucial to maintaining your vehicle and keeping it running smoothly. 

 Engine oil has limited life - after a certain point it starts losing lubricating qualities and carbonizes. Once it happens, the engine gets contaminated with carbon deposits or sludge (see the photo) that significantly shorten engine's life. When you change oil at or before manufacturer suggested interval, you change the oil before this "carbonizing" point, engine remains clean and once refilled with new oil ready to work hard again. If the engine oil has not been changed for long, carbon deposits start clogging the oil pick-up screen decreasing oil supply and increasing friction. Through the engine ventilation system the same carbon deposits build up inside the throttle body and EGR system causing rough idle and possible check engine light. Compression decreases and engine start wearing much faster. 

 If you don't remember when you changed the oil in your car last time - just check the oil on the dipstick. And every time you change the oil, the oil filter should be replaced as well. For correct oil type, engine oil capacity, maintenance schedule, etc. check your car owner's manual

With that being said, lets get started changing your own oil.

First step in changing your own oil will be to drive to the nearest car parts store to procure the appropriate engine oil + filter for your car.  Please refer to your manual for the recommended oil.  Generally, it is as follows:  10w30 for summer, 5w30 for winter.

Drive your car until it reaches its "normal operating" temperature [ie. drive it for at least 20 minutes].  This should be accomplished as you drive to your favorite car parts store.

Once you have warmed up the engine, head back home and lay down a plastic sheet where the car will be jacked up.  The plastic sheet will protect the work surface as well as the environment against any oil spills.

Once in position, jack up the vehicle or use appropriate ramps to raise the front end of the vehicle.  Ramps are a quick, and generally safe alternative to jacking up your vehicle - you may consider purchasing a set of ramps just for oil changes.  If you purchase a set of ramps, we recommend you buy ramps made of specially treated rubber - they are very solid and will not gouge your driveway as most metal ramps will.

Now you must find the engine oil drain plug.  This is generally found on the bottom of the engine, in the lowest possible position .. generally facing towards the rear wheels.

Once you have found the drain plug, position your oil catch pan under the drain plug.  As a last minute note, make sure your container is large enough to contain all of the engine oil about to be released.  Check your manual for "crank case" or "engine oil" capacity.

Put on your vinyl gloves at this point and loosen the drain plug with your wrench or ratchet set.  As a tip, if your catch pan does not have some form of "filter" to prevent the drain plug from falling into a tub of hot engine oil, tie a piece of dental floss around the drain plug bolt.

The dental floss trick can save you from a major headache!

Once you are ready, remove the drain plug completely.  Extremely hot engine oil will begin to leak out of the engine so be ready!

Once the drain pan is in proper position and catching oil, remove the "oil cap" on the top of the engine to expedite the draining process.  Be sure you know where the "oil cap" is on your engine before draining the engine oil.

Let the engine oil drain for 20 to 30 minutes if possible.  You can continue to the next step whenever you feel you have allowed enough oil to drain, though do not rush the process too much.

During this process, you should measure out the appropriate amount of engine oil to re-fill the crank case.  Pour the measured amount into your oil pitcher.

Factory spec. for a Mazda MX-5 Miata is: 

dry engine:  { 4.0 L \ 4.2 US qt. \ 3.5 Imp. qt. }

refill only:  { 3.6 L \ 3.8 US. qt. \ 3.2 Imp. qt. }

refill w/ filter:  { 3.75 L \ 3.8 US qt. \ 3.3 Imp. qt. }

 Once the new engine oil has been measured out, be sure to "prime" the new oil filter by filling it with fresh engine oil and allowing it to sit for a few minutes.  Repeat the process once more and pour out any un-absorbed oil back into the clean oil container.

This process is to both protect the new filter from tearing due to sudden oil pressure on a "dry" medium, and to provide the engine with some oil upon starting up.

With the remaining clean engine oil, flush the engine of as much dirty oil as possible.  Do this by pouring the clean oil into the engine from the "fill cap".  Use a funnel to prevent spillage.

Once again, let the engine sit for a few minutes to allow the oil to escape the engine.  Now is a good time to locate your oil filter if you are unfamiliar with its location.

Occasionally, it is beneficial to purchase a crank case flush kit from your parts store to remove any gummy deposits of oil from the engine.  Be sure you follow the manufacturer directions should you buy such a kit.

Next step will be to remove the old engine oil filter.  Be cautious during this stage - you may burn your arms on hot engine components when trying to release the oil filter.

Also ensure that the oil filter does not tip over - avoid spilling any oil as much as possible.  Some oil will inevitably leak, so be prepared with a few rags.

When you are ready, remove the oil filter by turning it counter-clockwise.  If required, use an oil filter wrench to loosen the old oil filter.

Once the old oil filter is removed, clean the oil filter mounting flange + threads with a clean rag.  This is to ensure you do not damage the threaded boss on the engine - pain in the butt to repair.

Next, oil the rubber o-ring on the new oil filter with some clean engine oil.  Now install the new oil filter using only your hands.  Once the filter is fully seated on the engine, ensure that the filter is on fairly tight - once again only using your hands.

 ext, re-install the oil drain plug .. be sure to use a new crush washer on the drain plug bolt if there was one there to begin with.

The drain bolt should generally be "torqued" down to factory spec.  If you are not sure what the torque spec. is, make it snug, but do not over-tighten!

At this stage, you are ready to re-fill the engine with fresh engine oil.  Be sure to only pour a measured amount into the engine - over filling can be bad for your engine .. though do not worry if you only over fill by a small margin. But remember, if you over fill a-lot you will soon find oil stains in your drive way, and your engine will start to burn oil, and once this process is started it may be irreversible.

 Be sure to check the oil level using the dip-stick.  Add oil until you reach the "full" mark.  Check the dip-stick often through out the filling process to be absolutely sure you have filled the crank case to the proper amount. Once topped up, be sure to replace the oil fill cap.  If you don't, engine oil will bathe your engine's exterior next time you drive it hard - just ask Shaun (he was the victim of a "quick-oil-change" place once).  Next, check the dip-stick to ensure you have filled the engine with the appropriate amount of engine oil. Next, pour the used engine oil into the newly emptied container.

 Be sure to clean up any mess you might have made - a hint:  cat litter or sawdust is great for soaking up oil spills - just be sure to properly dispose of the absorbed oil!

Clean up your work area, jack down the vehicle and drive to the nearest oil disposal location.  You're done!  You just saved $20 or more and you are beginning to better understand your car.

As a precaution, for the following few days, place a piece of cardboard under your car when you park on your driveway.  The cardboard will catch any oil that you might have missed during the clean up process - if you see more than a few small oil patches on the cardboard, check for an oil leak at either the drain plug, or the oil filter.