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The 15.5 Briggs does not have an oil filter.
what weight oil for 6.5 engine
SAE 30 weight full synthetic oil.
Click the link and find your engine for the exact capacity.
what grade of oil on this engine
A Briggs and Stratton 17.5 horsepower engine can use any type of small engine motor oil. A heavy duty motor oil is recommended.
Briggs and Stratton is a select brand of lawn mower. When oiling one's Briggs and Stratton lawn mower engine, it is best to use a high quality oil. One can find such an oil at their local home improvement store, such as Home Depot.
1ml
Briggs & Stratton part # 491056 NAPA filter # 1348
There are a couple different oil filters that fit a Briggs and Stratton 24 hp engine. The most common oil filter is a PE 105.
You can get that info on the Briggs and Stratton website. Just go to: http://www.ereplacementparts.com/briggs-and-stratton-parts-c-16758.html?gclid=CPCZj4vGr58CFZdM5Qodp3bDsA and enter your engine model number.
Briggs and Stratton recommends SEA30 oil.