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This made me think of a minivan that was used as a shuttle at a plant I worked at. in normal use, it barely got to 25 mph, and was mostly driven very slow. All day it would shuttle people between several buildings. About once a month they would take it out on the highway and floor it to clean it out. This was a 1999/2000 model, with modern fuel injection. It would still get build up and other issues with all that low speed, low load driving. I remember the exhaust would start to smell bad. I think part of it was moisture in the exhaust gasses condensing on the exhaust pipes and building up.
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