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mower blowing a lot of smoke

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06-16-01, 02:25 PM   #1  
I have a Jacobsen push lawn mower. The other day I mistakenly added 5W 30 oil instead of the recommended 10W 30. Now when I try to use the mower smoke billows out from the exhaust and it will eventually lose power and stop. I also noticed some oil dripping from the exhaust. What have I done? Is there that much of a difference between 5W and 10W? Or did I overfill the oil or do something else wrong?

Will draining and changing the oil help? Or is it time for me to look for a new mower?

Thank you for any advice.

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06-16-01, 02:40 PM   #2  
Hello parso123

Chances are real good you have simply overfilled the crankcase. Empty it and refill it slowly and check the oils level. Add less then is required and top off bit bit checking several times.

I do not suggest using a multigrade oil in lawn mowers. A straight 30 weight oil will do fine. If the manufacturer suggests 10W 30 check an be sure this weight oil isn't intended strictly for cold weather useage only.

A straight weight 30W oil is perfectly fine for mowers with a few "Smile... Miles" on them.

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Bare in mind my company no longer services nor repairs lawn and garden powered equipment. Rest assured and fully confident, the help I offer you is based upon my prior years in this industry, with this type of equipment and is specific and accurate...

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06-17-01, 06:24 PM   #3  
SAE or "Straight" 30 is preferred because it will not breakdown with heat as easily. It does not change viscosity like a multigrade oil does.

If you think about it, you want thicker oil in the summer (which is why most lawn mower manuals suggest SAE30), and that is why SAE30 is used.

Contrary, if you probably look in many snowblower manuals, you will see 10W30 recommended. Why? Because 10W30 is a multigrade oil and acts like a 10 grade oil in the winter and a 30 grade oil in the summer. That is why you see it used in cars.

Oil grading is typified by the "anticipated temperature range" of use between now and the next oil change. Look in an automobile owner's manual or any equipment manual, and you will usually see a bar graph showing temperature and what grades of oil are approved for those anticipated temperatures. Since small engines are seasonally used (most don't use their lawnmowers in the dead of winter....or snowblowers in August), the grading system is slightly different.

If you use 10W30 in a motor that uses SAE30, be sure to check it more often as oil consumption is likely to be higher.

Hope that helps.

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06-19-01, 08:33 AM   #4  

I would like to thank all of you who took the time to respond. I had overfilled the oil , like Tom B suspected,
and after draining to the right level the mower now runs fine.

thanks all.

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