Why is White / Blue Smoke Coming from the Engine?
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
Inoperative crankcase breather
Crankcase air leak
Blown head gasket
Worn cylinder and/or rings
Turning/tilting the engine on its side for storage, oil change or any other reason
Note: If the engine has to be tilted, ensure the spark plug is facing upwards to help prevent oil from escaping the crankcase.
Other reasons for blue or white smoke from engines include:
Exceeding the engine’s oil capacity shown on
An obstruction in the breather tube (located behind the air filter)
Damages to the cylinder/piston rings
Engine oil capacity is dependent on your specific engine model and can be determined by checking the Oil Recommendation FAQ.
Are you tilting the engine or using it at more than a
15 degreeangle? Tilting your mower or equipment can cause leaks. Right the machine before moving forward
Checking and changing the oil is an easy troubleshooting technique for this problem. Check to see if the oil is overflowing or you’re using the wrong grade/type
Check the crankcase for leaks
Is the head gasket blown?
Are the rings and/or cylinder worn?
You can find specific small engine repair instructions in the Briggs & Stratton Repair Manual.
WARNING: Always read the engine and equipment manual(s) before starting
Shop Related Maintenance Parts
Learn how to properly and safely use, troubleshoot, and maintain your lawn mower, tractor, snow blower and other lawn and garden equipment.
Learn about the latest products by Briggs & Stratton, step-by-step instructions on how to locate your lawn mower engine model number and more!