Protecting Older Engines from Ethanol Fuel Damage

Marvel Mystery Oil: A Simple Fix for Gasohol Issues

E10 (10% ethanol) fuel dries out older engines (1970s–80s mowers, tillers, generators) by reducing lubrication in the upper cylinder. The fix: add 1 capful of Marvel Mystery Oil per tank fill.

Why It Works

Marvel Mystery Oil restores lubricity, preventing valve and cylinder wear. A mechanic friend uses it in a 1990 Toyota and 1975 motorcycle—engines run smoother, last longer.

Other Tips

• Use fuel stabilizer for seasonal equipment.
• Drain tanks before long storage.
• Source ethanol-free fuel if available (marinas, some stations).

Cheap insurance for vintage iron.