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Thread: 5w30 vs 5w20... dont throw rocks!!!

  1. #1
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    5w30 vs 5w20... dont throw rocks!!!

    just dumped out 5w20 mobil 1 full syn after 2700 miles because i get like that.. like black water...car is stock with a tune and it is not hammered except for the occasional 6100 rpm blast once a week
    if i am lucky and only when fully warmed up.
    will be doing the 5 w 30 thing from now on as i have dumped it in the past at 3500 miles (4.6 sohc) and wondered if i wasnt too premature as it looked not bad coming out
    imho 5w20 is just too thin!!!
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  2. #2
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    Ford specked out 5W-20 for almost all it's gas engines. Never had a problem with it.
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  3. #3
    hitchhiker Guest
    I remember when I was a kid and the folks used 20 in the winter and 30 in the summer.

    Then along came 10 W 40

    Now I just use what the book says. 5 W 20 Syn. blend it is.


  4. #4
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    Quote Originally Posted by hitchhiker
    Now I just use what the book says. 5 W 20 Syn. blend it is.

    Yep, that's how I look at it too.
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  5. #5
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    Quote Originally Posted by kj31067
    just dumped out 5w20 mobil 1 full syn after 2700 miles because i get like that.. like black water...car is stock with a tune and it is not hammered except for the occasional 6100 rpm blast once a week
    if i am lucky and only when fully warmed up.
    will be doing the 5 w 30 thing from now on as i have dumped it in the past at 3500 miles (4.6 sohc) and wondered if i wasnt too premature as it looked not bad coming out
    imho 5w20 is just too thin!!!
    I stay with the 5W-20 as that is what Ford recommends.

    Someone here tried different weight oils and found the 5W20 to be sufficient in spite of how thin the oil actually is.

    Mike.

  6. #6
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    Thumbs down 5w-20.....

    Quote Originally Posted by Bigdogjim
    Ford specked out 5W-20 for almost all it's gas engines. Never had a problem with it.
    Quote Originally Posted by MM2004
    I stay with the 5W-20 as that is what Ford recommends.
    Mike.
    It works for me, I change my oil every 2500-3000 miles and never had any issues with the protection.

    I have an oil analysis every other oil change and my oil is good to go, according to.....http://www.blackstone-labs.com/

    Try them out for yourself and see.
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  7. #7
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    kj31067, how many miles are on your engine? What is your normal OCI? Have you always used a certain oil and just switched to M1 recently? Do you use any oil or fuel additives regularly?

    Although there is nothing about the Marauder engine that requires 5W-20 or forbids 5W-30, I'm surprised that you say Mobil 1 5W-20 becomes "like black water" after only 2700 miles. I am currently using a blend of M1 5W-20 and 5W-30 to obtain a specific viscosity and my oil still has plenty of life left at 5,000 miles.
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  8. #8
    Quote Originally Posted by hitchhiker
    I remember when I was a kid and the folks used 20 in the winter and 30 in the summer.

    Then along came 10 W 40

    Now I just use what the book says. 5 W 20 Syn. blend it is.

    Which book calls for synthetic?

  9. #9
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    The engine calls for 5w20 I use 5w20.
    Im sure Ford knows better then I do what viscosity will work best in my engine.
    Plus its so thin that you are sure to drain all the oil completely out in less time.

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  10. #10
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    My last oil change was back to 5w 20. I may be crazy, but the car seems faster..

    I could not get 5w 20 where we used to live. I can get it now, so thats what I use. 'cuz Ford sez so.

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  11. #11
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    I tried 5w-30 Mobil 1 for the same reason. I went back to the 5w-20, Royal Purple. Engine runs smoother and better MPG.
    2004 DTR Marauder, Built 26 February 2004, Inservice: 02 July 2004 Retired from DD 17 July 2008. Survived the cut, 28 April 2012. Back as a DD as of 18 November 2012.

  12. #12
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    Quote Originally Posted by RF Overlord
    kj31067, how many miles are on your engine? What is your normal OCI? Have you always used a certain oil and just switched to M1 recently? Do you use any oil or fuel additives regularly?

    Although there is nothing about the Marauder engine that requires 5W-20 or forbids 5W-30, I'm surprised that you say Mobil 1 5W-20 becomes "like black water" after only 2700 miles. I am currently using a blend of M1 5W-20 and 5W-30 to obtain a specific viscosity and my oil still has plenty of life left at 5,000 miles.


    i ve got 30k and this is the second oil change as i bought the car in april. i ve only dumped it twice. yesterday and back in late april.
    i always use mobil 1 full syn and i dont put anything in crankcase but mobil i every 3k and nothing in tank but 93 octane
    i was wondering what mix of 20 and 30 weight you use and why?
    keith
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  13. #13
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    5w20 will give you better gas mileage, but so slight you will likely never notice it. Do not kid yourself, the only reason Ford shifted to 5w20 was for CAFE (corporate average fuel economy). You can read all about it here themotoroilsite.com or at other similar sites. Look on page 113 of the motor oil bible.

    Is 5w20 adequate? Yes. Is it the best oil for long life or protection of your motor. No.

    This is just my opinion from what I have read. I use a high quality full synthetic 5w30 in both my ford truck and the mm, especially since I live in the heat of south FL.
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  14. #14
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    keith, it's possible the previous owner didn't take as good care of the car as you do...the Mobil 1 could just be cleaning the motor better than whatever oil the p.o. used.

    While an oil's appearance is not considered to be an accurate indication of its condition, I can understand your concern if the oil isn't behaving as you expected or it's behaviour changed all of a sudden. Switching to M1 5W-30 will not be a problem, so if it works better for you, then good on ya...

    BTW, check your PMs...
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  15. #15
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    Quote Originally Posted by juno
    5w20 will give you better gas mileage, but so slight you will likely never notice it. Do not kid yourself, the only reason Ford shifted to 5w20 was for CAFE (corporate average fuel economy). You can read all about it here themotoroilsite.com or at other similar sites. Look on page 113 of the motor oil bible.

    Is 5w20 adequate? Yes. Is it the best oil for long life or protection of your motor. No.

    This is just my opinion from what I have read. I use a high quality full synthetic 5w30 in both my ford truck and the mm, especially since I live in the heat of south FL.
    I posted this in another oil thread. I think it fits here too.
    Quote Originally Posted by SergntMac
    You have heard the best of the best here explain things, I can't say anything any better. But, I can add...

    The lubrication system is also a component of engine cooling. Last July/August (Chicago's hottest season), I ran of series of tests on different weight oils. With a 180 stat, the lowest and most consistent coolant temps came from the 5W20 weight oils, synthetic, or, dino blend didn't matter. The highest temps resulted from the thicker oils, such as 5W40 and 10W30, again irrespective of synthetic or dino.

    If you continue to drive on lower octane and run the engine a few degrees hotter than ideal, you are going to detonate, or, pre-ignite, and both will be fatal over time.

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