Shell Rotella 15w-40 motor oil

[ChevySSR]

my 2014 SSV maintenance records showed 15w40, when I was picking Tahoe up from the department, I asked to talk to the maintenance crew and they told me to keep on 15w40, they do that for all fleet cars after 90k miles. According to them this prevents many issues with oil consumption later on. I thought about going back to 5w30 in the winter, but for now am on 15w40.

i went back to 5w30 mobile1 for the winter, I noticed absolutely no change in oil pressure after the oil change. I am monitoring the oil consumption closely, but so far has not seen any.

 

[rdezs]

2014 Escalade, 168,000 MI, no trace of oil in the intake. No catch can either.

2003 Hummer 6.0 liter, went through the motor couple months ago. Updated valve cover. It did need new valve guides and seals when going through the head. 5,000 miles on it since rebuild, also no oil in the intake. Neither vehicle uses a drop of oil between changes at 4,000 miles. (The Hummer used to put a lot of oil into the intake. Went through the motor to 112,000 miles.)

 

[rdezs]

Mobile one 5W30 on both

 

[j91z28d1]

no oil on a ls intake?

I'd kinda have to see that. even the valley baffled ones they suck in oil

 

[rdezs]

The number one cause is worn valve guides and valve seals, right there under the valve cover. I usually go through my LS cylinder heads around 75,000 miles. I view it as a regular maintenance item. Granted, no doubt the heads would continue going for another 250,000 miles... I just personally have zero tolerance for any oil leaks, seepage or excess blow by.
Call it OCD... But there's nothing better than a fresh set of heads