Here's why:
* Engine Model Matters: The oil capacity varies greatly depending on the specific engine model. Briggs & Stratton makes many different engines with 15.5 HP.
* Manual is Crucial: The only way to know the exact oil capacity for your engine is to consult the owner's manual. It will clearly state the amount of oil your engine requires.
Where to Find Your Manual:
* Online: Search for your engine's model number on the Briggs & Stratton website. You may find a downloadable manual.
* Original Packaging: If you still have the original packaging, it may have included the manual.
* Dealer: A local Briggs & Stratton dealer might have a copy of the manual.
Important Reminder: Always use the correct oil type and quantity specified in your engine's manual. Overfilling or using the wrong oil can damage your engine.
