# Re:

Posted by Will (93 4dsc) on September 20, 2004 at 17:00:59: In Reply to: Care to explain why? n/m posted by PaxMax on September 20, 2004 at 14:08:49: I guess a few of the guys here took care of the explaining! :) But yeah, loss of compression with age is legit, because with worn piston rings, things aren't sealed as tight as when it was new. As Jeff92se alluded to, a well-maintained motor with little wear can maintain its near-spec compression even at 8-10 years old. Also, with the fuel system, if you are still running on original fuel injectors, it's intuitive that over time, those injectors will have some blockage, albeit not enough to necessarily cause driveability problems. There would be an additive effect of course, which can contribute to decreased hp. Moreover, with increased carbon build-up in the engine (with age), a motor's octane requirement generally increases. However, the mentality with many car owners is that with age, there is no point in buying good fuel, so as a result, you may not be getting well-regulated combustion. In my experience, not all engines will need this higher octane requirement, but some do, and it sure would not hurt any motor to be feeding it some good stuff. Replys: Re: Will (93 4dsc) 17:05:12 9/20/2004 (0)

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: I guess a few of the guys here took care of the explaining! :) But yeah, loss of compression with age is legit, because with worn piston rings, things aren't sealed as tight as when it was new. As Jeff92se alluded to, a well-maintained motor with little wear can maintain its near-spec compression even at 8-10 years old. Also, with the fuel system, if you are still running on original fuel injectors, it's intuitive that over time, those injectors will have some blockage, albeit not enough to necessarily cause driveability problems. There would be an additive effect of course, which can contribute to decreased hp. Moreover, with increased carbon build-up in the engine (with age), a motor's octane requirement generally increases. However, the mentality with many car owners is that with age, there is no point in buying good fuel, so as a result, you may not be getting well-regulated combustion. In my experience, not all engines will need this higher octane requirement, but some do, and it sure would not hurt any motor to be feeding it some good stuff.