I'm wondering if there are any negative consequences to running Shell Rotella 15w-40 oil in this motor.

It seems to be running alright. There was a leak, but I didn't have time to fix it, so I decided to see if this slightly thicker stuff would help save the engine until a later time, considering the 10w-30 was somehow running out quicker than we could fill 'er up.

I've heard a number of theories, such as this oil is so thick that it can cause damage to the oil pump, the excess pressure can cause damage, cause long cranks, cause the engine to dirty more easily, etc.

Is any of that true??

EDIT: Location is the Mississippi Gulf Coast... around 92 degree temps for the next few days.

 

rotella?! lmao

i think you mayyy be ok. but **** man. why?

 

you should fix the leak....the 15w40 wont do squat for oil leaks.

 

Been running it for a couple thousand, maybe... I thought it was causing a no start issue I was having. But it was NOT the issue.

I'm gonna have to check the MPG before I fix the leak, tho.

I'm a fan of the oil, tho. It seems to be just thick enough to stop the leaks. No need to add more oil every week or so. I'm personally not the primary driver of the vehicle, so it was a good quick fix for the time being. I guess I'll just let 'er get a bit blacker before I flush it.

Since it's not realy leaking now, I guess I'll just replace the oil pan gasket and switch back to 10w-30.

 

15w40 will cause slightly less mpg, more wear on cold start ups, etc. Think about it if it really is thick enough to slow down a leak, how good do you think its flowing around the inside of the engine, not very good..