Engine/Transmission (1994 - 1998) Bad oil

[joewarner]

I tried Pennzoil "long life" 15w40 cummins spec'ed on my last oil change and got a surprise. On a 200 mile trip the truck spit 4 quarts out the vent tube. It did not occur to me that the oil was the problem, so I had the truck checked out. Found nothing, so did another oil change with Rotella---problem cured. something to keep in mind

 

[Vaughn MacKenzie]

Being it's Pennzoil I'm not too shocked. It's been considered one of the worst oils you can buy for years. Vaughn

 

[dalton4]

Joe, very interesting situation. If the oil was the problem, why wasn't the problem still taking place when the truck was checked out prior to doing the oil change?

 

[DCaswell]

Very interesting, do not know what caused that to happen but it was not the oil. I am no fan of Pennzoil but none of the major brands are "BAD" products, some are better than others to be sure but there is another reason to spit out 4 qts like that.

 

[joewarner]

The tech at the Cummins shop said that some oils even though cummins approved and spec'ed 15w40 can be to thin, and, or too easily caused to foam. --- All I know is Rotella from now on.