Here's my situation ... I have '02 2500HD with 6.0L that will be soon to roll over 100K miles. Being the original owner, I observed that during the first 35K miles that it does not burn a drop of oil. Then it has started to burn oil gradually. By around 70K miles it has started to burn coolant as well. There is zero visual leak anywhere at all, so I am pretty confident the motor are burning these fluids.
I have noticed that if I do alot of city driving (staying under 55 mph) that it would burn a quart every 2500-3000 miles. However, when I do alot of highway driving (65-70 mph), it would burn a quart every 700-1000 miles and continue to get worse
If I recall correctly, it burned a quart every ~1500 miles at 70k mark, every ~1000 miles at 80-90K mark, and now every ~700 miles at 100K mark. I am amazed that my catalytic converters have not plugged up yet!
So, is this clear-cut that my motor need to be rebuilt or replaced? I did replace the PCV valve awhile ago which made no difference.
I have noticed that if I do alot of city driving (staying under 55 mph) that it would burn a quart every 2500-3000 miles. However, when I do alot of highway driving (65-70 mph), it would burn a quart every 700-1000 miles and continue to get worse
If I recall correctly, it burned a quart every ~1500 miles at 70k mark, every ~1000 miles at 80-90K mark, and now every ~700 miles at 100K mark. I am amazed that my catalytic converters have not plugged up yet!
So, is this clear-cut that my motor need to be rebuilt or replaced? I did replace the PCV valve awhile ago which made no difference.