Oil leakage, low power, different engine muffler sound, occasional backfire

This occured upon start up after sitting in the barn for 2 weeks

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A worn cylinder might leak oil, especially if seals are worn or old and cracked. An air leak in the crankcase, clogged or inoperative breather, or worn-out dipstick O-ring can all produce oil leaks. Regular maintenance and replacement of worn seals and other parts can cure leaks and prolong mower life.
Blue or white smoke coming from your engine usually indicates burning oil, which can be caused by: Overfilling the crankcase with oil. Incorrect oil grades. Operating engine at greater than a 15 degree angle.
Briggs And Stratton Blowing Oil Out Exhaust

It could mean that the oil level is too high, the piston rings are worn, the valves are leaking, or the breather tube is blocked. If left unaddressed, these issues can cause further damage to your engine.

It`s normal to have a few oil drips a few hours after an oil change. However, any more than that, and you`ll need to determine where the leak is coming from. There are several ways to determine if the leak is coming from the drain plug, such as the gasket part being worn or dirty.
The vast majority of leaks are due to degraded engine gaskets, oil pan leaks, oil seals or bad connections. Crawl under the car and check the oil pan seals. While you`re there also check the oil pan drain plug. Next check the timing cover seal and the valve cover gaskets.
Check the fuel shut-off valve for leaks, and ensure that the fuel lines fit tightly on the valve. If the fuel shut-off valve is leaking, replace it. In addition, inspect the fuel shut off lines for cracks or tiny holes. If a fuel shut-off line is leaking, replace it.
Burning oil is often the result of worn-out parts. For example, worn valve seals and/or piston rings could lead to your car burning oil. Both valve seals and piston rings work to keep engine oil out of the combustion chamber.
Blue or white smoke coming from your engine usually indicates burning oil, which can be caused by: Overfilling the crankcase with oil. Incorrect oil grades. Operating engine at greater than a 15 degree angle.
The engine block can crack behind the exhaust manifold and cause an oil leak. Depending upon the severity of the crack it can be sealed to stop the leak.
The gasket is probably the most common cause of oil leaks, especially in older vehicles or vehicles that are used frequently & have a high number of miles. The gasket is a seal that joins the head two metal parts of the engine, such as the between the block and the head(s) as well as the engine block and the oil pan.
What does “oil leak but not excessive” mean on an MOT? To be honest, this means exactly what it says – you`ve got an oil leak somewhere, but it`s not leaking enough to cause a concern.
If a larger amount of oil is leaking and burning, you will see visible smoke coming from under the hood. Not only does this suggest a leak, it can also rapidly deteriorate other components in the vehicle. If you see smoke coming from your vehicle`s engine, get it checked by a professional immediately.
Internal oil leak

Leaking in the vehicle`s oil passages can also lead to low pressure. Internal oil leaks can be caused by a myriad of factors, including worn piston rings and valve seals or PCV valve failure.

While corporate executives who preside over failure often find someone else to blame, Briggs` demise has, in reality, directly resulted from its executives` mismanagement, greed and pathological animosity towards the unionized workers who had made them rich. Reprinted with permission of Wisconsin Examiner.
Engine oil leaks are one of the most common causes of engine damage. They cause rapid deterioration of the engine and result in expensive repairs. Worse yet, engine oil leaks pose a safety threat. They may lead to the loss of control of the vehicle while driving.
Potential Causes for Burning Oil

Rather than remove combustion gases, oil ends up getting sucked into the engine through the air intake. In most cases, resolving this issue simply requires replacing the PCV valve.

Without a reliable spark from your spark plugs, your engine has to account for the underperformance. It does so by increasing fuel in your cylinders to maintain the pressure in your combustion chamber. As a result, your fuel economy worsens, and oil consumption increases.
Blue smoke from the exhaust: Bluish smoke can indicate your car is burning oil during the combustion cycle. Burning oil smell: A thick burning oil smell could mean oil is seeping onto hot engine parts. Frequent low oil light warnings: Regular low oil warnings can indicate excessive oil consumption or a car burning oil.
White smoke from your exhaust almost always indicates a blown head gasket, and just like there is coolant mixed with your engine oil, there will also be engine oil mixed with your coolant.
When the oil leaks into the combustion chamber, it mixes with the fuel and air being ignited and gets blown out of the tailpipe along with them. The result is white or bluish-white smoke. This is a problem because oil does not belong in the combustion chamber.
Your car exhaust system operates by removing waste products that are produced while it is working. The exhaust releases the byproducts, and you might see a small amount of water leaking. A small amount of water dripping from the car`s exhaust isn`t a big concern.
When too much oil is added, the level in the oil pan becomes too high. That allows a fast-moving lobed rod called the crankshaft to come into contact with the oil and essentially aerate it. The result is a foamy, frothy substance that cannot properly lubricate the engine.

Discover Relevant Questions and Answers for Your Specific Issue

the most relevant questions and answers related to your specific issue

Oil quanity I have 20 hp craftsman briggs and stratton twin how much oil when you change out oil
ANSWER : Usually 1 qt

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How do I remove and clean air filter? – Briggs & Stratton Lawn-Boy 10640 20-Inch 6.5 HP Gas Powered Lawn Mower
ANSWER : There should be a square of plastic on the side of the engine which is opposite of the muffler. It has a small hex head with a slot cut in it. Remove this plastic cover and the air cleaner should be inside of it.

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Oil leaking from under the exhaust mower has been
ANSWER : Souds like the carb needs cleand out it has stuck open and let the gas run in to the moter

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Can you put synthetic oil in a briggs and stratton motors
ANSWER : Every time i tried they started to leak

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What oil do you use in the YT4000 lawn tractor with 24 hp v-twin
ANSWER : 10w-30

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How many cycles is a 6.25 hp Briggs & Stratton engine ?
ANSWER : 4 cycle.

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Briggs and stratton 6.5 started smoking so changed oil in hopes would help still smoking
ANSWER : Sounds like it broke a ring to fix better to buy new moter not worth trying to fix

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I have a yth2246 riding mower. what type of oil should i use?
ANSWER : Hello, Typ of oil – best for this engine is SAE 5W-30 and company – maybe Castrol. If you change oil with oil filter you need oil 64 oz if without oil filter – 60oz.

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