Internal combustion engines are made of many precision machined moving parts that work together under extreme stress from heat and pressure. Working in these conditions for tens of thousands of miles, even the best-kept engines will build up deposits from carbon and other combustion byproducts. Normal wear increases internal clearances, which can lead to issues like an increase in oil past the piston rings. This is common in higher-mileage engines and can reduce
combustion efficiency while contributing to deposit formation in critical areas.

Fuel injectors are a common casualty of these deposits. Tiny pinholes can get clogged, leading to improper fuel spray patterns, incomplete combustion and poor engine performance. Left untreated, these problems can lead to costly engine damage.

Injector deposits tend to build gradually, and the symptoms can develop over time. Even small changes in fuel delivery can show up in everyday driving. You may notice:

These issues can have multiple causes, but in engines with more than 75,000 miles, injector deposits are often part of the problem.

In higher-mileage vehicles, use Sea Foam High Mileage Fuel Injector Cleaner regularly as part of routine maintenance—at every oil change or every 4,000 miles, whichever comes first. It can also be helpful when:

• You notice a rough idle, hesitation or reduced fuel economy
• Acceleration feels less responsive than it used to
• The vehicle experiences heavy stop-and-go driving or irregular use

One bottle is highly effective in a single tank, but engines with heavy buildup might require multiple treatments. Regular use of Sea Foam High Mileage Fuel Injector Cleaner is a good way to prevent new deposits from forming. Using it is simple: