18 to 20 oz
5w30
10w30 0r 10w40 both seem to work well.
The manufacturer recommends using a 5w-30 oil in this engine for the most part. The exception is for synthetic oil, in which case you could use 10w-30.
"6.6 craftsman " is insufficient info. -If you expect a sensible answer, please describe it fully.
Briggs and Stratton only recommend using their own brand of lawnmower oil. This oil is available in stores for around $6 for 18oz. This particular oil is designed to be compatible with air cooled engines.
Motor oil. DO NOT USE VEGETABLE OIL!! (personal experience)
75W90
30 wt
sae30
That depends on which engine is in the mower. If it is a Briggs it takes SAE 30. If it is a Kohler it usually takes 10W-30.
SAE 30 weight or SAE 10W-30 weight. I recommend you use 100% synthetic oil in your air-cooled engine.
10w-30w is fine