Read what he wrote properly mate. He stated they were in his opinion unnecessary and explained why and to my mind I am siding with his opinion also. No production cars come out the factory with these fitted to the oil sump as standard Rob pointed out their use in a "sealed for life" gearbox which I also agree with but I fail to see how one could prolong engine longevity drastically with one of these unless fitted on an engine with zero miles. It is also more than likely that the life span of an engine will outlast your ownership so again I can see why they are unnecessary. Fail to see how his logic is flawed.