How to find the right Automotive Replacement Ventilation Grommets AI guide

Standard Motor Products: PCV grommets sized to specific valves and engines.
Dorman: Packaged PCV and valve-cover grommets with application listings.
Motorcraft: OE grommets for Ford engines.
ACDelco: OE grommets for GM engines.
Mopar: OE grommets for Chrysler-group engines.

Written by an AI model from its trained knowledge.

What the AI looks for in Automotive Replacement Ventilation Grommets

Bore and outer diameter: Match the grommet's inner diameter to the valve or tube and its outer diameter and groove to the valve-cover hole thickness, ideally by part number for your engine. An undersized or oversized grommet either won't hold the valve or creates a vacuum leak.
Oil and heat-resistant compound: Choose grommets made for engine-oil and under-hood heat exposure. Do not use generic rubber grommets. Ordinary rubber swells, softens or hardens in oil vapor and heat, and soon leaks.
Replace with the valve: Install a new grommet any time the PCV valve is removed if the old one is hard, cracked or misshapen. Aged grommets often tear or lose their seal when the valve is pulled out.

Generic hardware-store rubber grommets in the valve cover.
Using sealant to hold a loose grommet in place instead of fitting the correct size.
Stretching an undersized grommet over the valve.

Usually yes on older engines, because the grommet hardens and stops sealing. A fresh grommet also makes the new valve easier to seat.