There are a number of different deposit control additive chemistries that fuel companies use. Most of them do an adequate job in the engine’s intake system. However, many additives also contribute to combustion chamber deposits. Excessive combustion chamber deposits can cause an engine to need higher octane fuel to avoid knock, run-on or reduced engine performance. These excessive deposits can also cause increased emissions of nitrogen oxides. In contrast, Caltex with Techron® provides unbeatable intake system performance as well as avoids contributing harmful combustion chamber deposits.
Deposits form on intake valves and ports because they operate at high temperatures in a very reactive environment whenever the engine is running. If the deposits become heavy, they reduce engine power because they restrict and alter the flow of air and fuel into and within the cylinder. In some sensitive fuel-injected engines, even low levels of intake valve deposits can harm performance. Cold-start and warm-up drivability can be adversely affected and exhaust emissions increase. The magnitude of the emissions increase can be surprisingly large. This occurs because the deposits act somewhat like a sponge, absorbing and then releasing fuel, which upsets the ratio of fuel and air, particularly as the engine is changing speed. Other valve deposit problems include valve sticking because deposits interfere with the valve stem sliding in its guide. Another problem involves burned valves because severe deposits prevent the valve from seating properly.
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