Will Synthetic Motor Oil Cause Engine Seal Leaks? Let's find out!

  • Published on: 07 October 2019
  • 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

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    This video is only for entertainment purposes. If you rely on the information portrayed in this video, you assume the responsibility for the results. Project Farm LLC
  • Runtime : 12:23
  • Seafoam oil marvel mystery oil seefoam does seafoam work project farm amazon basics oil mobil 1 synthetic oil shell rotella t6 shell rotella gas truck oil shell rotella gas truck shell rotella T4 T-6 t-4 rotella rotella t6 15w40 synthetic shell rotella t6 5w-40 synthetic oil leaks synthetic oil seal leaks


  • Alex m.
    Alex m.   5 hours ago

    You should do a re refined vs new engine oil

  • 84fiveo
    84fiveo   10 hours ago

    Project Farm I have an idea. It would be interesting to see the difference if you put the hot cooked oil on the lubricity tester. I'm curious if the oil that protects best when it is at room temperature is also the oil that protects best when it is hot.Thank you and keep up the interesting videos

  • eric huizer
    eric huizer   1 days ago

    Swapped to syntetic oil in my 81 Ford, after 6 years and 12000 hours (odometer broke so installed hour-meter) no leaks.

  • makos asimakis
    makos asimakis   1 days ago

    You are referring to old cars ? Because some manufacturers like bmw for example since 2000 ,recommends fully synthetic oil and regular maintenance.

  • Zisis Papalampidis
    Zisis Papalampidis   2 days ago

    The only way a synthetic oil to cause a seal leak is if the seal was already damaged and oil sludge acted as a sealant. When high quality synthetic oil cleans the sludge the damaged seal will leak. Synthetic oil doesn't cause any damage to the seals. It has a similar result of using a sludge engine cleaner, sludge is removed, other already existing problems come to the surface. Final result... synthetic oil doesn't cause any damage to any part of a healthy engine.

  • Cameron Townsend
    Cameron Townsend   2 days ago

    Put synthetic oil in a 72 Duster based off a friend’s recommendation. It either leaked out or burnt up resulting in the engine seized. This was manny years ago.

  • Space Suitor
    Space Suitor   3 days ago

    "This coffee tastes like paint."sip It is paint! Nyuk-nyuk.

  • TFrax
    TFrax   3 days ago

    This is the kind of guy wranglerstar pretends to be. Project Farm teaches and informs his viewers with honesty. wranglerstars channel is just crap products he wants you to buy at his amazon store

  • Ed Axeman
    Ed Axeman   4 days ago

    The old rumor that syn oil makes seals leak, was about Rope Seals, which leaked easily anyway. And supposedly because syn oil was so slippery the rope seal couldn't stop it from sliding past. I'm old so I remember crap like that. 😜🤷‍♀️

  • cthorhaug
    cthorhaug   4 days ago

    I JUST HAD AN IDEA!!! as a farmer, i know the huge need for phosphorus and zinc for plants. maybe adding these 2 to an old oil would revive it?.. maybe adding soluable fertilizer to cheap oil will significantly improve it?.. ive given u MULLLLLLLTIPLE ideas now and havent even seen a single one mentioned. maybe this one, thus time, would make the cut..

  • HeadTheBall202
    HeadTheBall202   4 days ago

    Dont know if its already been tested , but is it posible that a (high performance) engine wich is used to run on semi synthetic motoroil , consume more motoroil after i change the oil with full synthetic motoroil ? I notice that my KTM fourstroke enduro bike consume more synthetic oil since the last oilchange .

  • Joshua Davey
    Joshua Davey   4 days ago

    I think you're supposed to go from conventional oil to semi-synthetic then full synthetic.

  • Lovely Job
    Lovely Job   5 days ago

    T6 is better at low and high temperature and has a greater film wear resistance? That’s a surprise! Would you please do a similar experiment on high revolution motorcycle engine?

  • Dylan Clay
    Dylan Clay   5 days ago

    Synthetic oil doesn't cause leaks but it can make existing leaks worse , happened to my old silverado .

  • john milner
    john milner   5 days ago

    97 dodge caravan 3.3 liter,198K miles...had regular 10w30 oil,no leaks,.changed to synthetic 10w30 and viola..rear main seal leaks about 1/2 quart in 2 months

  • Azzo
    Azzo   5 days ago

    That tractor is built like a tank, new ones are not one tenth the quality! And the torque on that PTO driveshaft is crazy

  • Dig
    Dig   5 days ago

    Mowing backwards, popping wheelies, your having fun, good! 👍 Thumbs up and subscribed?

  • Steve Cooper
    Steve Cooper   6 days ago

    Synthetic oil removed the crud around my 1999 suv seals. The suv has leaked ever since. I only used synthetic for one oil change.

  • marcelino gutierrez
    marcelino gutierrez   6 days ago

    i have used mainly synthetic oil in my 98 silverado 5.7 but have switched back to conventional from time to time no leaks or problems 410000 miles so far

  • for2utube
    for2utube   6 days ago

    In the ‘old days’ I had a carbureted Ford 429, when I switched to synthetic I had to back off the idle screw a bit or it idled too high. A few years later when I went back to conventional I had to turn up the idle screw again. Did you notice any idle speed changes with your tractor?

  • pfoxhound
    pfoxhound   6 days ago

    Shims for crank shaft use soft metals, non magnetic.

  • King Kennedy
    King Kennedy   6 days ago

    Do you have any videos of best oil filters to use?

  • S Tay
    S Tay   6 days ago

    In all seriousness I have subscribed to your channel to learn about new products and have learned a wealth of knowledge. I have found your content to be straight forward and to the point. I also have switched certain products just from watching your testing. Always look forward to new content from you. Keep up the good work.

  • Jack Buys
    Jack Buys   1 weeks ago

    just curious if the synthetic got past the rings in their worn state. I changed to synthetic in a Honda Civic with 140,000 miles and the oil consumption dramatically increased. I know that if you use synthetic in a newer engine the oil consumption is close to nothing.....

  • Khan Arif Masud
    Khan Arif Masud   1 weeks ago

    You are doing everything that I would have loved to do but never had the guts. Thank you.

  • Luke Harner
    Luke Harner   1 weeks ago

    That old tractor looked good for being 45 years old

  • Picard + Discovery Fandom

    I love watching your tests and reviews! I'd like to see you test a synthetic oil in a turbocharged and non-turbo engine to see if the oil breaks down faster in the turbo engine.

  • Agent 007
    Agent 007   1 weeks ago

    I switched to synthetic my last oil change. After 15 years and 150000 ...I now have a leak 🙃. Going back to conventional next oil change.

  • David Goetz
    David Goetz   1 weeks ago

    Awesome video!! Cool video from the Air! Nice clean older blue tractor, thanks guy!

  • Nathaniel
    Nathaniel   1 weeks ago

    Now tie 10 push mowers behind the tractor and put different "fuels" and "oils" in them to compare their performance

  • Mac J
    Mac J   1 weeks ago

    It doesn't cause a leak. It find existing weak spots.

  • Kain J
    Kain J   1 weeks ago

    Synthetic oil is causing leaks on my 2007 Santa Fe.

  • Gary Arbogast
    Gary Arbogast   1 weeks ago

    I really think that synthetic oils tend to be more aggressive in cleaning the internal parts of an engine. They can remove sludge and polymerized layers of old oil in various working surfaces and even around engine seals and gaskets. In some cases what is preventing an old engine from leaking is just layers of crud against the surfaces that can leak. Once you strip that crud away, now you have a leak or leaks on your hands. So as much as I love and appreciate the benefits of synthetics, I would be hesitant to put it in an older engine with high miles or high hours on it.

  • Gilberto Diaz-Castro
    Gilberto Diaz-Castro   1 weeks ago

    After working for over 40 years on all types of vehicles and support equipment (generators and air compressors) I've learned that synthetic oil use has caused leaks to start on equipment but it is not because the oil damages any component or seals; the reason these leaks start is that synthetic oils have a higher detergent content and they clean up all the dried up gunk between the seals and the shafts. these deposits are built up over years of use and they get caked on to the seals, once the synthetic oil cleans this mess up the hardened seals are not able to keep the oil in the assemblies. So the answer is NO, synthetic oil does not cause leaks, worn seals/shafts do.

  • Nad Ronnoco artwork
    Nad Ronnoco artwork   2 weeks ago

    Best channel to watch before making purchase your unsure of for sure .. great work informative and thanks for all the hard work and time

  • Bryant Fry
    Bryant Fry   2 weeks ago

    Could you do a test of synthetic oils in a push mower? They're not specifically designed for that application, and it would be interesting to see how they wear.