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Are you still under warranty for these parts? Otherwise OEM is important only to the purist. Now having said that, is your car a collectable? OEM parts are good, they have been tested to a point where the company feels they will survive the warranty. Or it is so minute that they will replace it once in the lifetime of the warranty. Aftermarket will usually be better, not always, it will be a bad selling point if the buyer has no clue of what they are getting. Your value of the aftermarket part will be half at best on resale. JMHO
 

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The term 'Aftermarket' can be rather confusing.....for example: A GM wheel bearing, original equipment part number, purchased from Rock Auto parts, is considered 'Aftermarket' in general terms.
In this case, you have a OE part marketed through a aftermarket channel.

Same part source, Rock Auto, also sells wheel bearings for the same car produced by different manufacturers......maybe located in China, or Poland. Generally less expensive than the GM part from the same supplier.
These are true 'aftermarket' replacement parts.
Often, the inexpensive parts are used by those willing to 'roll the dice' in the name of quality, or folks that are repairing the car prior to selling it.

So, to be more definitive, aftermarket is any replacement part that uses a different part number than a manufacturer CURRENTLY (part numbers change) uses for the same replacement component.

Confusing?

Rob
 

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How important are OEM parts? Under warranty and afterwards? Pros and cons? I get the basics but if I use aftermarket parts how can it be negative in the long run? Novice
For ME, I look at aftermarket parts as a potential risk for substituting quality. Now let me also say that there are a number of aftermarket parts manufacturers that can and do produce quality replacement parts. They may be equal in quality and may in fact be even produced by the OE supplier for GM but possibly licensed to be sold under a different brand but we the consumer would NEVER know about it.

So you'll have to ask yourself this question - how important is the mechanical health of your vehicle to you and do you plan to keep the vehicle for a long time?

For ME personally, the answers are YES and YES. In all of my previously owned newly purchased vehicles I have always gone for the cheaper discount auto parts store replacement parts. And while these parts did their job some may have failed prematurely while others faired well but may have not lived as long as the original OEM part. Also, and this may sound odd, but for me it also changed the character and feel of the vehicle when adding foreign parts. It just didn't feel original to me. Didn't feel like stock. Almost as if the car is out of balance. For this reason I have vowed to use only OEM parts for both of my current newer vehicles. This includes ALL fluids, mechanical and electrical parts. Well actually the engine oil I pick up at Walmart and is the Pennzoil variant. :)

Thankfully this has served me well and 5 years later with almost 101K on the odometer I have had no major issues to report (*knocks on wood). All parts are replaced as instructed in accordance to the owners manual via the Maintenance Guide. And to this day my vehicle runs wonderfully.

I should also point out that OE parts are not always perfect and some will fail prematurely. However I still feel confident using only original parts.
 

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It takes research and depends on the part. The majority of parts I usually stick with OEM. But sometimes if you do research you can find that some aftermarket parts are made better than OEM. It just depends and you have to do some research.
 
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