We recommend the use of Briggs & Stratton Synthetic Oil. The use of this high-quality detergent oil assures compliance with Briggs & Stratton warranty requirements regarding the use of appropriate oil. Engine break-in procedures using synthetic oil remain the same.Click to see full answer. Consequently, how much oil goes in a Bolens push mower?Refill the crankcase with the amount and type of oil recommended by the engine manufacturer. Most small engines need 20 to 24 fluid ounces of oil. Small engines typically use SAE 30 single-weight detergent motor oil service-rated SG or higher, but some can use multiviscosity oils such as 10W-30 or 10W-40.Beside above, can I use 10w30 instead of SAE 30 in my lawn mower? Yes; you can make use of it. But there are other factors you need to consider. These include temperature and the engine. Older engines can use the SAE30, while the 10W30 is for modern engines. One may also ask, can you use regular motor oil in a lawn mower? SAE 30 motor oil is commonly recommended for use in a lawn mower engine, but the safest best is to use the type of oil your lawn mower manufacturer recommends. Often 10W-30 or 10W-40, the same motor oil types that are used in vehicles, can also be used in a lawn mower.What if I put too much oil in my lawn mower?Too much oil in the crankcase can damage the motor of the lawn mower. Too much oil can also cause the lawn mower to leak which can damage other parts of the lawn mower other than its motor. This is a classic case of when too much or too little can affect how an engine works.