For a Moen cartridge (or any residential plumbing fixture containing rubber seals and O-rings), you should exclusively use waterproof, food-grade silicone grease (often sold as plumber's grease). Never use petroleum-based lubricants like Vaseline, motor oil, or standard WD-40, because petroleum chemical compounds attack and degrade rubber and plastic materials over time, causing premature seal failure and water leaks. Verification: Check the tube label to confirm the lubricant is 100-percent silicone and safe for drinking water contact.
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