I have an ISX15 2350 engine in my Peterbilt. It burns about a gallon of oil per 2000miles. It's done it for awhile...but runs good.
Anyway, I had the bright idea to change oil this summer and filled it with Rotella 15w40 and a gallon of Lucas. Seemed to help a little but still had to add oil every few days. About a month or so later, I added another gallon of Lucas.
It didn't help much and continued adding 15w40 as necessary.
Then awhile later we did a full change using Valvoline conventional 15w40.
It ran about 6000 miles and the pressure was getting lower. I changed the filter and it was good again.
About 4000 miles later and it needed to be changed again.
Not sure what's going on.
Should I flush the engine and do oil change? Not sure if there's sludge or what ....
Anyway, I had the bright idea to change oil this summer and filled it with Rotella 15w40 and a gallon of Lucas. Seemed to help a little but still had to add oil every few days. About a month or so later, I added another gallon of Lucas.
It didn't help much and continued adding 15w40 as necessary.
Then awhile later we did a full change using Valvoline conventional 15w40.
It ran about 6000 miles and the pressure was getting lower. I changed the filter and it was good again.
About 4000 miles later and it needed to be changed again.
Not sure what's going on.
Should I flush the engine and do oil change? Not sure if there's sludge or what ....