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30 W motor oil is what is called for in the owner’s manual for all small engines now.

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Briggs & Stratton 100005 SAE 30W Engine Oil – 18 Oz.
10W30 is a common motor oil grade suitable for many lawn mowers. Your owner`s manual will tell you the exact grade required, but in almost all cases 10W30 is the right stuff for a four-stroke engines. Any brand of oil that`s suitable for cars or trucks will work fine in your mower.
The Full-Synthetic SAE 5W-30 SN Motor Oil is designed for 4-Cycle lawn mowers and snow blower engines.
The most recommended craftsman lawnmower oil is SAE 10W-30. SAE 5W-30 is the most dependable oil for colder regions and improves mower performance and efficiency. Synthetic lawn mower oil lasts longer than traditional oils and can provide more time in-between oil changes.
One of the biggest advantages of using 10W30 oils is that they can sometimes be used in place of SAE 30. While it is not recommended, doing so will not cause damage to the engine. This is due to the multi-grade oil properties that make this particular oil flexible enough to use in various temperature conditions.
Engines on most outdoor power equipment operate well with 5W30 Synthetic oil. For equipment operated in hot temperatures, Vanguard 15W50 Synthetic oil provides the best protection.
The easiest way to tell a 2-cycle engine from a 4-cycle engine is the number of fuel tank and/or oil sump fill ports. A 2-cycle engine has one fill port with a cap that has fuel pump and oil can icon. The cap will usually state the oil to fuel mix ratio.
There`s not much difference between 10W-30 and 10W-40 motor oil. What sets them apart has more to do with temperature fluctuations and engine load. For moderate weather, either engine oil grades should work fine.
SAE 30 – Warmer temperatures, most common oil for small engines. SAE 10W-30 – Varying temperature range, this grade of oil improves cold-weather starting, but may increase oil consumption. Synthetic SAE 5W-30 – Best protection at all temperatures as well as improved starting with less oil consumption.
Oil for four-stroke lawn mower

Most lawn mower engines use SAE30 oil or 10W-30 oil, which are also popular options for auto engine oil. The oil you use for your car`s engine is the same one you can use for your lawn mower.

Car oil is similar to lawn mower oil, and you can use it in lawn mowers with four-stroke engines. However, car oil has a high concentration of additives and can damage smaller engines. It`s also important to match base oils; otherwise, you risk damaging your lawn mower`s motor.
Is SAE 30 Oil The Same As 10W-30? No. Unlike SAE 30, SAE 10W-30 is multi grade oil. SAE 10W-30 has SAE 10W viscosity at a lower temperature and SAE 30 viscosity at a hotter operating temp.
A common question is whether it`s safe to use 10W-30 instead of 5W-30 oil, for example. While it`s best to use what`s recommended in your owner`s manual, inadvertently using a viscosity one grade higher or lower than what`s recommended generally poses no long-term harm.
You can use 10w30 instead of 5w30 oil since both meet the SAE standard for viscosity at operating temperatures. Generally, the viscosity difference between the two is neglectable. However, it`s important to note that a 10w30 oil will move slower than a 5w30 oil in cold environments.
SAE, the acronym for the Society of Automotive Engineers, is responsible for establishing a classification system based solely on oil viscosity. To classify the oils, their viscosity is measured in cold conditions at different temperatures below zero, and then in hot conditions at 100ºC.
5W-30 oil is the lead viscosity recommendation by automakers over the past four decades for use in many vehicle types – passenger cars, SUVs, light vans and trucks – including those with high-performance turbo-charged and supercharged engines.
SAE 30 is better suited for smaller machines, such as mower engines, under warm weather conditions, while 5W30 is often used for larger engines under low-temperature situations.
SAE 30 the most common, and is is typically used in warmer climates. SAE 10W-30 is best for varying temperature ranges and is best for starting in cold climates. The trade off here is the potential for higher oil consumption. Synthetic oil is also an option for your riding lawn mower.
Motor Oil Shelf Life

Simply put, the shelf life of conventional motor or “lube” oil is up to five years. It`s not something that goes bad in a couple of months.

The vast majority of the small engines Briggs & Stratton manufactures are 4-cycle engines, which require four strokes of the piston to complete a crankshaft revolution.
There is no difference between “2-cycle” and “4-cycle” fuel except that 2-cycle engines use the fuel as a lubricant, so oil has to be mixed in with the fuel (gasoline). 4-cycle engines are usually made to closer tolerances so having oil mixed with the fuel can gum them up and cause overheating.
Within reason, thicker oil maintains a better lubricant film between moving parts. Some have even used thicker oil in a leaky engine to prevent oil from seeping out. But really, thicker oil is not good for your engine. Not when “thicker” means higher viscosity than the manufacturer recommends.
The difference between 10W-30 and a 10W-40 is the high temperature viscosity. Obviously, a 10W-40 is thicker than a 10W-30 at high temperature.
A 20W50 runs cooler than 10W30 engine oil. 20W50 is also better at blocking out heat, making it stronger at preventing engine failure. The 20W50 has a thicker consistency and flows more slowly than 10W30, while the 10W30 has a thinner consistency and flows faster than 20W50.

Discover Relevant Questions and Answers for Your Specific Issue

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What type of oil for 17.5 42 500 cc – Craftsman 17.5 hp 42 in. Deck Lawn Tractor – CA Model
ANSWER : I use straight 30wt.

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What size belt is required for my 19.5 hp craftsman LT1000 42″ mower deck
ANSWER : Deck Belt Part #144959. Thet belt is 1/2 wide by 11/32 thick by 95.25 long. Sears Parts Direct lists it for $34.99 + Shipping..

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Dont know what type of oil to use – Toro Power Lawn Mower
ANSWER : Put straight 30 weight motor oil in it. Not 10W30 or any multi-viscosity oil. Straight 30 weight motor oil. If you’re doing a complete oil change, then you may want to use Synthetic 30 weight, which will last longer between oil changes and also make your engine last longer (but it costs more too). Best of luck to you.James

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Looking for a side discharge cover for the craftsman lt1000 model 971271813

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I have a briggs motor – Craftsman Gold mower – need to know what type of oil to put in it. I used 4 cycle same as my snowblower but seems to smoke. Is this the correct oil?

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I need replacement blades for a Craftsman LT1000
ANSWER : Get part # or model# from owners manual and go to and order or stop into a local sears with the numbers and theyll set you up!

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Need to put oil in and don’t know what kind of oil to put in or if it’s gas oil mix????


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I need to know what type oil to put in a 9hp
rider, briggs and stratton engine
ANSWER : For summer use it would be SAE 30 or 10W/30. Approx. 48OZ.

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