Diesel engines in heavy-duty trucks (aka big rigs) may reach up to 1 million miles or more before they need any major engine repairs. They’re known to last up to 30 years if they receive proper care and maintenance. Underground tanks are less of an aesthetic concern. This may mean they require less maintenance to keep up on the overall look of the tank as well. Shelf Life. Overall, both tanks can last for decades if well maintained. A variety of factors determine how long the tank will be used. IKH5.

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