It depends ive went through two of them. When you did it did you go through and retorque the bolts? As for the oil smell I switched to synthetic at 40k and don't have those issues any more. Oil might be seeping from the rear main but its not pouring out so your good for awhile. I don't know what you can use in Canada but I used to run lucas oil treatment in my jeep and got 300k before the trans went lucas thickens the oil and quiets the motor. It also slowed down the oil seepage.