It all depends on what parts you’re talking about when it comes to OEM vs after market. Most times, the after market manufacturer is that same manufacturers that made the OEM part. For example Exedy for drive train components.
Unless you need a part that is really hard to get, [b]you are wasting your money going to the dealer and buying OEM.
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Here’s my qualification -some after market parts are crap and yo9u can’t tell, BUT OEM does not guaranty that your part is any better.
Here’s the kicker, for parts that don’t really sell well, the parts companies will outsource their manufacturing to a company that makes them and sometimes, it’s just one or two companies in China, Korea or God knows where.
In other words, you have no choice but to buy after market and MAYBE crap.
My Dad is a retired auto engineer who has worked for just about all of them and the stories …
The automotive industry has undergone some serious consolidation several years ago. It’s common for the exact same parts to appear in a Mercedes, Audi, Buick, Chevy, Kia, and any really cheap car.
Some parts stores will list all the cars that a certain part fits. Go ahead and read that sometime. It’s a REAL eye opener!
Here’s what I do: compare part numbers. Many distributors are too lazy to use their own part numbers. You’ll see for example clutch kits from many different suppliers using 4161 – that’s an Exedy part number. MAYBE there’s a duplicate – MAYBE – but the components are exact in design.
And then there are horrible manufacturing runs where a bunch of parts come out crappy – for many reasons.
What I’m trying to say is that you can’t tell.