Will 4-stroke oil damage a 2-stroke engine? Let's find out!

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  • Published on:  Monday, July 9, 2018
  • Will 4-stroke oil in 2-stroke engine cause damage? We tested the ability of 4-stroke oil to mix with gasoline, took before and after looks at the cylinder wall inside of 2 different engines. Additionally, we performed compression testing and measured engine temperature, using 2-stroke oil as our baseline. Many thanks to all those who left comments requesting this video. Please keep the requests coming. I read and reply to a lot of comments. Finally, thank you very much for supporting the channel by watching the commercials and through Patreon support. This allows me to decline all sponsorship opportunities and remain unbiased, since I have nothing to sell nor do I have a corporate sponsor to please. Thanks again! https://www.patreon.com/projectfarm
  • Source: https://youtu.be/c4J76MgdyQc


  • Don Ready

    Don Ready

     2 hours ago

    Love your videos. Why 16:1 mix ratio? Most oils are 50:1

  • daniel jonhson

    daniel jonhson


    Well now you know if you're out riding around on your bike with the two stroke engine and you run out of fuel you can stop at a gas station and use 4 stroke oil to get you home.

  • CPT E B Hammonds

    CPT E B Hammonds


    I'm just about to unsubscribe because your videos are too long. I find myself not watching anymore because of that.

  • tejas


     2 days ago +1

    I would like to know if gaffers tape performs better than duct tape or not .....
    : )

  • Savneet Singh rai rai

    Savneet Singh rai rai

     2 days ago

    Well I got vespa stroke 150cc i add gear oil to its chamber 650 ml ....and if i don't get 2t oil i mix cars 4stroke oil as %is required the engine runs well but with either of it the silencer need to cut open n clean at same interval ...but new gen 2t generates less smoke ...it's back in 97 i was kid I used 4stroke oil and gas.....it genrated less smoke ...but now 2t engine scooters n motor cycles are long gone due to emmision norms...

  • Mon Frig

    Mon Frig

     2 days ago

    This is a STUPID experiment

  • Chris Dunphy

    Chris Dunphy

     3 days ago

    Nice to know an emergency you can use it for a short period of time Thank you I appreciate the video

  • Davide Bacchi

    Davide Bacchi

     3 days ago

    Another good question is how much 2-stroke oil should I add to petrol tu run smoothly a diesel engine? Is 2-stroke usual ratio of 2,5% enough? This question came up when my grandfather filled his delivery van with petrol (engine was knoking and heating a little more) I was wandering if adding 2 stroke oil would add enough lubricity to petrol to make the engine run smooth.

  • rad randy bowler

    rad randy bowler

     3 days ago

    It works for a while months even but will eventually gum up the engine.

  • Ray Mathews

    Ray Mathews

     3 days ago

    No 4 stroke oil won't hurt a two stroke engine.
    My dad owned a Saab96 and it had a 3cylinder 2stroke engine, and I used Texaco 4 cycle oil in my dad's Saab96 one time and it worked pretty good.

  • gmctech


     4 days ago +1

    Great great video.... About 10 years ago I was in a situation after a massive snow and ice storm here where I had no choice but to use Rotella T5 IIRC as mixing oil in my Stihl MS880 and it cut downed trees all day long for approximately 8 hours straight without a hitch. It did eventually foul up the plug prety good but that 880 still runs strong and hard like a champ. As a general rule I use 2 stroke mixing oil but if need be i wouldn't hesitate to grab any multi-grade 4 stroke engine oil with the Starburst to use as mixing oil.

  • John Clarke

    John Clarke

     4 days ago

    The problem with a test like this is there are idiots out there that will try it, smoke their engines and then blame you with the letter from their attorney to follow. There are lots of thing I know but I learned a long time ago to keep them to myself, because the world is full of idiots and morons that take things out of context and then blame you for their folly. Darwin is alive and well in most communities.

  • Carl Ray

    Carl Ray

     5 days ago

    I prefer my gasoline shaken, not stirred. LOL

  • Jack Of All Master Of None

    Jack Of All Master Of None

     6 days ago

    In the old days they only had and used regular motor oil for 2 stroke..thus the reason for such heavy mixes of 16:1 and 24:1 etc

  • ronald hickman

    ronald hickman

     6 days ago

    Looks like the test engine already had ring and cylinder wall lubrication issues before the test even took place....

  • Attis0609


     6 days ago

    not gasoline.. petrol....

    because the 2 stroke engine use petrol....

    the gasoline goes to the diesel engine..

  • John Sholl

    John Sholl

     6 days ago

    I ran Vitalis hair oil in my 1957 BelAir when I was a greaser with no problems. Had to rebuild engine every 100 miles or so

  • Seeking The Truth

    Seeking The Truth

     7 days ago

    I used 4 stroke 20W 50 engine oil in an emergency on my 1977 Yamnaha CT 175 and it worked fine. It just smelled bad and smoked more.

  • brandon dellangelo

    brandon dellangelo

     7 days ago

    I love your videos!!!!! I see how precise your testing is and I've been watching this other channel that goes to new tool conventions and their test make me so mad after watching your videos because the test they're doing are not even.

  • MrFuncat


     7 days ago

    If you do a similar test in the future, put the oil in the container first. In cases where you are mixing large quantities, i.e. a boat tank, it is impossible to stir.