Question about Briggs & Stratton Lawn-Boy 10640 20-Inch 6.5 HP Gas Powered Lawn Mower

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What kind of lawnmower oil does my lawnmower takes the model number is 10640

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Lawn mower grade strait 30

Posted on Jul 30, 2009


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What kinda of oil do i use for my lawnmower

Two choices I'd recommend if you change your oil faithfully than you can use a SAE 30 weight oil. A lot of manufacturers will recommend using the newer version of oil that doesn't break down as quick where as a lawn mower motor runs at such high temperatures due to being an air cooled engine. Most auto supply stores or lawn and garden dealers will carry the longer life based oil, but personally I prefer to stay with what has worked for me for many years. Preventative maintenance , (Faithfully) for me means every spring. Good Luck

Jul 10, 2014 | Craftsman 17.5 hp 42 in. Deck Lawn Tractor...

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Help line for craftman lawnmower

Could you check the model number again and provide the Brand?

Jun 03, 2014 | Craftsman 20 Hp 42" Deck Lawn Tractor

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My lawnmower takes 15 -20 mins to warm up.

Check oil may have low oil shutoff and drain gas and start with new

Feb 25, 2014 | Briggs & Stratton Lawn-Boy 10640 20-Inch...

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Take the old plug out and it will have numbers on the side. Simply match them up and you can cross-reference them on the package of any other plug that looks like it fits. But I'm guessing that mower has a Brigg's and Stratton engine and the plug will probably be a RJ19LM (Champion Number), which is what 99 percent of the engines I work on take (gapped at .030). Also, most mowers today run on straight 30 weight oil (not a multi-viscosity such as 10W30, Just 30 weight). Hope this helps you and good luck. P.S. Your owner's manual will tell you what you need to know and the engine sticker will tell you the oil.

Jun 27, 2011 | Poulan Pro 22" Self Propelled High Wheel...

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This engine takes a four cycle engine oil. SAE 30 weight should work fine. Any oil made for lawnmowers would do.

You may find the troybilt manual for this unit at: Link
The briggs and stratton manual can be found at their website at: Link. To look find the correct manual you will need to find the model and revision number from the inner side of frame, next to the engine. The model number will be a six digit number and the revision number should be two digits.

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May 01, 2011 | Briggs & Stratton Electrical Supplies

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Hi, what kind of oil can i put in my ridind lawnmower craftsman?

The domestic engines (Briggs, Tecumseh) take SAE 30 weight motor oil. The import engines (Honday, Kawasaki) usually take 10W30 motor oil. In either case, I recommend using a good quality name brand oil like Castrol, Pennzoil, etc. Most riding mower engine take about 48oz from a complete drain. If your engine has an external filter, it might require a few more ounces.
I hope this helps.

Aug 27, 2010 | Craftsman 42 in. Deck 19.5hp Lawn Tractor

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New Lawn boy 10640 mower - had for approximately 2 months, always worked fine. Saw that it was low in oil (naturally), added oil (did not overfill) and the pull cord won't work. It's stuck - everthing...

Don't throw it out. Remove the top plastic cover and it will be easy to access the starter/recoil unit. It should be easy to remove and take that off and diagnose the problem. Post back if need be.

Aug 13, 2010 | Briggs & Stratton Lawn-Boy 10640 20-Inch...

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What kind of oil should i use for my 6.5 briggs

Doesn't matter what kind of oil you use, as long as its SAE 10w-30.

Jul 03, 2010 | Briggs & Stratton Lawn-Boy 10640 20-Inch...

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Lawnmower engine idling to low

First, follow your throttle cable down to the carb. Locate the clamp that holds the housing in place and loosen it just enough to move the cable. Start the mower and adjust the idle by the screw that touches the same plate that your cable hooks to. Then push the throttle control to idle and retighten the cable clamp.

Apr 26, 2010 | Briggs & Stratton Lawn-Boy 10640 20-Inch...

2 Answers

Oil, how much

If you have the model number for that mower then go to and download the owners manual. It will tell you how much oil the mower will take.
Good luck!

Jul 28, 2009 | Craftsman 20 hp 42 in. Deck Yard Tractor

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