Have you ever had "check oil" light issue with your craftsman GT? My engine Is a briggs 18 I assume its a 422XXX (the plate with model # is missing). So according to manual I put in 48 oz SAE30 (no filter on engine). Soil oil light starts coming on. I check stick it shows "full" but I add 5 more oz. Then oil is burning in muffler, so I drain and put in 48 new oz of 10w30 synthetic. Oil light still comes on. Stick shows "full"