My engine oil smells like gas and i burn enough oil so that i have to fill it up 1/4 quart every few weeks or sometimes less. I heard that the gas in the oil thins it out. Im using 10w30 right now, should i use thicker oil? maybe 20w50? I plan on changing the piston rings this summer when i have time but for now what can i do? Is there any other problems or risks that i should know about with my semi bad piston rings?