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Thread: Oil Question

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    Oil Question

    I have a 5 year old Toro lawn mower with a Briggs engine. In the owners manual it says use SAE 30W detergent oil with an API service class of SF, SG, SH, SJ, SL or higher.

    I have a bunch of left over Honda SAE 5W-30 left over from the motorcyclke that I sold last year.

    Will this work?



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    Re: Oil Question

    If you are a riverboat gambler, it will work for awhile. Then on that hot Aug day, poof.


    Let my Fred's Posse Ride: Georges, Naz, Hogue, Bryce, Nader, Monte, Matt, and McKay.

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    Re: Oil Question

    Quote Originally Posted by dmclone View Post
    I have a 5 year old Toro lawn mower with a Briggs engine. In the owners manual it says use SAE 30W detergent oil with an API service class of SF, SG, SH, SJ, SL or higher.

    I have a bunch of left over Honda SAE 5W-30 left over from the motorcyclke that I sold last year.

    Will this work?
    I have done this before and not had problems but you are really pushing 5W-30 to the limit. If you love your mower, I would not recommend it. If you don't care, go for it.

    I did it in an older mower I didn't give a **** about but it didn't have any noticeable effect.

    Since it is 5W-30, couldn't you use the leftover for your car?



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    Re: Oil Question

    So I should get 10w-30 instead?



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    Re: Oil Question

    Quote Originally Posted by dmclone View Post
    So I should get 10w-30 instead?
    No. Just SAE30. Not xW-30



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    Re: Oil Question

    Sounds good. Thanks



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    Re: Oil Question

    I don't know. They all taste the same to me.


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    Re: Oil Question

    Quote Originally Posted by ruxCYtable View Post
    I have done this before and not had problems but you are really pushing 5W-30 to the limit. If you love your mower, I would not recommend it. If you don't care, go for it.

    I did it in an older mower I didn't give a **** about but it didn't have any noticeable effect.

    Since it is 5W-30, couldn't you use the leftover for your car?
    Correct me if I am wrong but the 5W just makes it more viscous in colder temps than the SAE meaning quicker lubrication during start up. 5W-30 still gives the same protection at engine operating temperatures as SAE 30. Hence the "30" in 5W-30. The 5W is just the cold temp rating


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    Re: Oil Question

    Just got back from HD and they have a nice little toro kit that includes the oil, filter and spark plug doe my model. About $5 cheaper than buying everything separate.



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    Re: Oil Question

    Quote Originally Posted by tazclone View Post
    Correct me if I am wrong but the 5W just makes it more viscous in colder temps than the SAE meaning quicker lubrication during start up. 5W-30 still gives the same protection at engine operating temperatures as SAE 30. Hence the "30" in 5W-30. The 5W is just the cold temp rating
    The 5W is, I believe, the natural viscosity of the oil. There are polymers that heat up and cause the oil to thicken to 30W in hotter temps. In theory, you are correct in that is SHOULD work the same. But there is some debate over whether a multi-viscosity oil, like 5W-30, can really sustain at 30W or if over time it becomes more like 5W-20 or even less. In that case, if that smaller, higher-revving and hotter engine really DOES need a true 30W oil, a 5W-30 oil may not be able to stand up to it for an extended period. It also may very well work just fine. But you are taking a risk, IMO.



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    Re: Oil Question

    This is for diesel motor oil but I'd guess gasoline motor oil is similar:




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    Re: Oil Question

    "Deleted post" Bad info corrected below.


    Last edited by Cyclonesrule91; 03-04-2011 at 12:41 PM.

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    Re: Oil Question

    Quote Originally Posted by isuaggie View Post
    This is for diesel motor oil but I'd guess gasoline motor oil is similar:

    So this kind of proves what Wesley said. It'd be OK most of the time but you get that hot August day and POOF.



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    Re: Oil Question

    Quote Originally Posted by isuaggie View Post
    This is for diesel motor oil but I'd guess gasoline motor oil is similar:

    Diesel is a whole different animal then gasoline because there is a lot more compression then with gas engines.



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    Re: Oil Question

    Quote Originally Posted by Cyclonesrule91 View Post
    I shouldn't matter because it is 30 weight in the summer anyway. The 5W just makes it thinner viscosity in the winter making it easier to start in the winter......which I am pretty sure you probably wouldn't need. It will work just fine, just make sure you check it before you mow each time you mow in case it breaks down any faster but you will be fine.
    I'm pretty sure it's the other way around. It is not a 30W oil that gets thinner in the winter. It is a 5W oil that gets THICKER in the summer. As I said in my previous post, in THEORY it should be OK. But a lot of "experts" would tell you that a 5W-30 oil will not stand up to higher temps like a straight SAE 30 will and the temp chart posted by aggie seems to indicate that as well.

    I just found this quote from a site called aa1car.com:

    "Motor oils that have a wider range viscosity rating such a 5W-30, 5W-40 and 0W-40 are blended with more base stocks and additives. Because of this, it may be harder for a wider range oil to remain in grade as the miles accumulate."

    So I would say it would be OK for a while but I would not anticipate a multi-viscosity oil to last as long as SAE 30 in hot temps.

    Here's another quote from a site called upmpg.com:

    "Multi-grade motor oils perform a great service not being too thick at cold startup to prevent engine wear by providing more instantaneous oil flow to critical engine parts. However, there is a draw back. These additives shear back in high heat or during high shear force operation and break down causing some sludging. What's worse is once the additive begins to be depleted the motor oil no long resists thinning so now you have a thinner motor oil at 210 degrees. Your 10W-30 motor oil can easily become a 10W-20 or even a SAE 10 (10W-10) motor oil. I don't have to tell you why that is bad. "



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