I have a 1995 Honda Accord with over 170k miles on it. I have the oil changed regularly every 3000 miles. My mechanic noticed the oil levels were pretty low at each oil change and took a deeper look. He said the timing valve had sprung a leak and fixing it would be an 8-10 hour job, which was really not worth fixing up in his opinion. If I buy a few quarts of the same oil and keep adding it if I feel the level is low (he recommended checking it every week), would that be okay?