AC Delco 0W-20 4500 kilometers 2018 Chev Silverado L86 GM EcoTec

[cdlamb]

2018 Chev Silverado.
Truck just recently had a lifter job completed at the Chev Dealership.
I was worried I might see higher levels of contaminants.

I posted the analysis earlier but they used a diesel motor oil as the reference oil

This analysis indicates some fuel dilution, which might not be too concerning, but wondering what caused the issues with the lifters at such early mileage.

I am still not completely sure on the virgin oil the dealership uses, and it may still be wrong.

 

[fantastic]

Chrome iron fuel silicon all elevated... yeah its not what you want to see. The silicon is higher than what I'd expect for the mileage so could be a possibility of root cause. Check air system. I agree the VOA doesn't look the same.

 

[Jetronic]

do you smeel fuel? with that drop in viscosity tere should be a LOT of fuel in the oil. it would also explain the extra wear. Do you have a logical explanation for the fuel, like short tripping?

 

[FZ1]

2018 Chev Silverado.
Truck just recently had a lifter job completed at the Chev Dealership.
I was worried I might see higher levels of contaminants.

I posted the analysis earlier but they used a diesel motor oil as the reference oil

This analysis indicates some fuel dilution, which might not be too concerning, but wondering what caused the issues with the lifters at such early mileage.

I am still not completely sure on the virgin oil the dealership uses, and it may still be wrong.


View attachment 258395

Vis too low try a 0w-30. .02

 

[cdlamb]

Vis too low try a 0w-30. .02

why not a 5w-30?

 

[cdlamb]

do you smeel fuel? with that drop in viscosity tere should be a LOT of fuel in the oil. it would also explain the extra wear. Do you have a logical explanation for the fuel, like short tripping?

I think it gets short tripped a lot. It has the DOD - Displacement on Demand, or AFM - Active Fuel Management, which deactivates half the cylinders when the load is light. Not sure how it works or if there is a chance it could still be flooding fuel to the cylinders.

 

[twX]

11 ppm Cr is really high. That much chromium can only really be coming from piston ring coatings. The lifters will be breaking in, but even if they use chromium steels, they wouldn't produce that much chromium relative to iron. I'd suspect an air filtration issue. Since you're in Sask, I'd imagine that this truck sees a lot of dust.

The 1 ppm of lead from bearing wear seems normal, but the 5 ppm tin seems high and it could also be from bearings. I'd compare these metals to the universal averages for this engine from a Blackstone UOA.

If the previous fill of oil was contaminated due to the lifter failure, some of that metal would have carried over to this fill. I'd do another short OCI and another UOA. Hopefully the metals will come down a lot.

 

[FZ1]

Vis too low try a 0w-30. .02

Just thought the 0w would be better in the cold.

 

[cdlamb]

11 ppm Cr is really high. That much chromium can only really be coming from piston ring coatings. The lifters will be breaking in, but even if they use chromium steels, they wouldn't produce that much chromium relative to iron. I'd suspect an air filtration issue. Since you're in Sask, I'd imagine that this truck sees a lot of dust.

The 1 ppm of lead from bearing wear seems normal, but the 5 ppm tin seems high and it could also be from bearings. I'd compare these metals to the universal averages for this engine from a Blackstone UOA.

If the previous fill of oil was contaminated due to the lifter failure, some of that metal would have carried over to this fill. I'd do another short OCI and another UOA. Hopefully the metals will come down a lot.

Yeah, I figured he should do an oil change as soon as possible, and follow up with a 2nd oil change, taking another sample for analysis on 3rd fill. I have seen in past samples that it takes 3 oil changes to flush out remnants of previous oil.

I am also not too sure how accurate the analysis was. I had issues getting the hose into the oil sump, and it was just residual oil that the tube was extracting from the dipstick tube. Apparently if I had used a tube the next size smaller it is supposed to get into the sump. need to replace the 1/4 inch tube with 3/16.

 

[cdlamb]

11 ppm Cr is really high. That much chromium can only really be coming from piston ring coatings. The lifters will be breaking in, but even if they use chromium steels, they wouldn't produce that much chromium relative to iron. I'd suspect an air filtration issue. Since you're in Sask, I'd imagine that this truck sees a lot of dust.

The 1 ppm of lead from bearing wear seems normal, but the 5 ppm tin seems high and it could also be from bearings. I'd compare these metals to the universal averages for this engine from a Blackstone UOA.

If the previous fill of oil was contaminated due to the lifter failure, some of that metal would have carried over to this fill. I'd do another short OCI and another UOA. Hopefully the metals will come down a lot.

Yes, I was hoping to see more data shared on here with that engine.
Can't seem to find any oil analysis shared on here for that one.