I have tried this grease. I tested it against Schaeffers #238, Delo 5% heavy duty and Swepco 110 Shock grease. The Delo 5% held up best, the Delo is a lithium and generally regarded as less water resistant than aluminum complex, however against the Premalube the Delo was much better. My opinion is Delo lasted longer than the Certified because the Delo greased parts always seemed more oily.