Originally Posted By: George7941
Originally Posted By: 1040 WreckerMan
Unless the engine is burning oil CI-4 isn't going to "hurt" anything and it was NEVER in any danger of hurting the engine - only the emissions after treatments.
All engines burn oil, ones in good shape will burn minimal amounts. If an engine is in good shape and burning, say, 1/2 litre per 5k mi, how much risk is there with CI-4 oil contaminating the exhaust catalyst?
Engines will USE oil, but when most shops refer to burning oil that is excess oil consumption. In a good running engine most of the oil lost will be out of the crank case breather.
At any rate, with your example there is no risk of contaminating the catalyst exactly. But some of that depends on what engine you are running which you didn't tell us. .5 Liters in 8,000K is much more significant in a 3.9l 4BTA than it is in a 15L ISX. The more oil the engine sends into the exhaust will progressively shorten the life of the DPF before it needs cleaning. If the engine is in good shape I have had no issue running CI-4 oils.
I think Cummins states on their heavy duty road engines that with CI-4 oil the DPF cleaning should happen at 100k miles rather than 150k miles. I'll have to dig up the TSB to be sure.