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Originally Posted by clf
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Which brings me.back to the Mercedes engine mentioned above. If a third party company is willing to create a new part for a relatively low sales volume engine, there must be some common occurrences for this to make financial sense to them.
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I agree with most of your post, which as usual is spot on. I would however say that none of Mercedes engines are low volume. They are all very high volume because Mercedes only produce a few engine types but apply them almost across the range. The 2.2 I4 and the 3.0 V6 used in the E-class being cases in point.
Also, whether a company produces an aftermarket part often depends on perceived need and whether the design/manufacture is straightforward. The cooler pipe T-piece on the 1.8K being a case in point. Whilst the original plastic item often lasts 10+ years and 100k miles, there was an aftermarket metal one produced. I just went and purchased a spare plastic item for around £18 knowing that if ever installed, it would outlast the car.
Upgrade parts are often not upgrades at all, just cheaper to purchase.