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Conventional Shell Rotella T4 15W-40 compared to Full Synthetic T6 5W-40 for causing engine seal leaks in a 45 year-old Ford 5000 tractor. I bought the oil used in this video and do not have any sponsors. Thank you very much for supporting the channel by watching the commercials and through Patreon support. https://www.patreon.com/projectfarm