Should the Oil Drain Plug Washer Be Replaced?

[MacAiden]

When changing the engine oil, it is generally recommended to replace the washer on the drain plug. Some vehicles may require replacing the drain plug itself. This is more commonly done at 4S shops, whereas repair shops often skip this step because they may not have the washers or drain plugs in stock. Whether to replace the drain plug or washer primarily depends on whether there is oil leakage. If there is leakage, replacement is necessary. Otherwise, sealant may be used as an alternative. Therefore, if there is no leakage, replacing the drain plug or washer is optional, but if leakage occurs, it must be replaced or addressed—though replacement is still the best solution. According to manufacturer maintenance standards, many bolts, especially aluminum ones, should be replaced. For example, transmission oil pan bolts and axle nuts are typically recommended for replacement after each removal. The same applies to certain sealing gaskets. However, not replacing these parts doesn’t necessarily lead to immediate issues, so it often remains an optional decision.