Description
Drain plugs may seem simple, but they play a crucial role in every oil change. Modern vehicles last longer and go farther between oil changes, meaning today’s drain plugs must endure many service cycles while maintaining a tight seal. Many designs now feature crush washers that deform slightly to ensure a leak-free fit—these should always be replaced during service. Others use polymer plugs with O-ring seals and twist-lock threads, which also require replacement of the O-ring each time. Over-torquing or using metal tools on these plugs can cause damage, especially on plastic designs. Always inspect threads for wear or cross-threading, and replace any questionable plug—whether metal or polymer. A small investment in a new drain plug or washer protects your customer’s engine from catastrophic oil loss and reinforces your reputation for professional, preventative care.