just FYI... not all CNG conversions are created equal. There are lots of low quality systems out there, and some mechanics cant tell the difference. Do your homework. Also, a conversion on a full size truck/SUV including tank and labor shouldnt be more than $7,000 or so. Payback is fast is you drive 25k miles per year. check out SkyCNG to learn more.
2010 and up CNG conversions
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CrashTestDummy
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Absolutely not! If done right, it's actually better for the engine. The byproducts of combustion are pretty much CO2 and water. There are a lot more combustion byproducts in burnt gasoline. These byproducts contaminate the oil and leave deposits in the combustion chamber and exhaust system.
While it's not the big deal it used to be, back when we ran leaded gasoline, CNG was very clean, and it was not uncommon to get CNG vehicles with >200K miles on the engine and still not need a rebuild. The oil lasts a lot longer between changes, and is much less contaminated when it is changed.
It's not for everybody, and finding CNG fill stations can be a hassle in certain places. A conversion is not something someone would normally do unless they plan to keep the vehicle a long time, or happen to live in a CNG-friendly area. With all the electronic doodads these trucks have on them these days that can go wrong with age, that you'll eventually not be able to fix, I don't see today's new cars lasting 15 years.
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