Solvents can damage certain plastics and rubbers found in the engine. This is the primary reason why oil system cleaning products should avoid using solvents. Many engines contain components made from materials that can degrade or be adversely affected by harsh chemical solvents, leading to potential damage or failure.
Oil system cleaning products should not use solvents because:
Solvents smell bad
Solvents have no impact on dirt and debris
Solvents are completely removed during the service
Solvents can damage certain plastics and rubbers found in the engine
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