Vapor Canister Vent Solenoid O-Ring Lubricant?

2001 FORD RANGER
277,000 MILES • 3.0L • V6 • 2WD • AUTOMATIC
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NIGHTHAWK4570
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For installation of the vapor canister vent solenoid, what type of o-ring lubricant should be used? Silicone-based, PTFE-based, etc? MERPOL O-Ring Seal Lubricant ESE-M99B144-B is what Ford specifies to use, but I've not been able to find that for sale and can't find much information about it searching online.
Jul 15, 2025 at 10:02 PM
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STEVE W.
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The Ford stuff is an old lubricant spec. I use synthetic lube on them. Silicone grease would work as does Super Lube O-Ring lube (or just the standard Super Lube). It just has to let it slip. Just don't use a common petroleum-based lube, that can damage the O-Ring.
Jul 16, 2025 at 12:38 AM
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NIGHTHAWK4570
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Thank you for responding so quickly. So, would dielectric/spark plug boot grease be suitable to use?
Jul 16, 2025 at 4:54 AM
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STEVE W.
  • ✓ASE Certified Mechanic
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  • ASE Certified Mechanic
That is usually petroleum based, not what I would want on an Oring. Some parts stores have small packets of silicone grease on the counter, used for brake slide pins.
Jul 16, 2025 at 8:54 AM
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