Lucas Oil 10279 Engine Oil Stop Leak - 1 Gallon (Pack of 4)

**** The Lucas Stop Leak product has garnered a diverse range of customer experiences, primarily hinging on the severity and type of oil leaks it is used to address. Several reviews stand out, suggesting that the product performs admirably for minor oil leaks, making it a go-to solution for both amateur and professional mechanics. Customers have noted successful results, with various users reporting complete cessation of minor leaks in a matter of weeks. Even in high-mileage scenarios, such as with a 2016 International Prostar boasting nearly a million miles, users have expressed satisfaction with how quickly the product worked to halt oil leaks. However, not all experiences have been favorable, particularly for those facing more significant or inherent mechanical issues. Customers have highlighted that while Lucas Stop Leak can effectively rejuvenate old and hardening seals, it is not a substitute for proper mechanical fixes when faced with substantial damage, like cracked gaskets or oil pans. As one certified auto technician pointed out, the product excels in stopping or slowing down leaks caused by aging seals due to extended oil change intervals, yet may not resolve leaks attributed to more severe breakdowns. While some users were disappointed by its efficacy on moderate leaks, suggesting that its high viscosity may not be suitable for all modern engines that require lighter oils, many still appreciate it as a reliable means for addressing minor issues. In summary, Lucas Stop Leak has found favor among those with minor oil leaks, while caution should be exercised for users facing significant mechanical failures. **