No, STA-BIL will not cause harmful changes to rubber seals or rubber fuel cell tanks when used as directed.
Sta-Bil Ethanol Treatment Stabilizer, 360° Protection, 8 Oz., Model# STAB22288

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- Ultimate treatment and protection against ethanol blended fuels, non-ethanol fuels and condensation
- Use in gasoline vehicles, including outdoor power equipment, motorcycles and other small engine vehicles
- Does not contain alcohol
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