Originally Posted by manybrews
pretty sure I know a thing or 2 about mitsu engines..... and you're NOT losing a quart every 500 because its 10w30.
I use ONLY 5w30 in all my cars, and im now on a second diamante with over 200,000 miles.
I use less than a quart every 1000 on one of them, and a quart every 2000 on the other.
no, the problem stems from either an improper repair, or something else. changing from 5w30 to 10w30 to 15w40 will have little to do with that.
truth is the thicker oils are generally bad for an engine.. they cause excess drag and wear, and usually will suffer a loss of milage and horsepower.