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Dealer Oil / 0W-20 / 5200 miles / 2018 Silverado #5254354 10/30/19 05:51 PM
Joined: Oct 2002
Posts: 2,794
Last_Z Offline OP
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Posts: 2,794
Team,

First oil analysis I post here in more than 13 years.

- 2018 Silverado 1500, Crew Cab, Z71 with the 5.3L (L83) engine
- No idea what oil the dealer used, but should be 0W-20/Dexos 1 as recommended
- 5200 miles on the oil...21,520 overall
- First 3K miles was mostly long trips visiting family and moving out of state. The second half is completely different...short trips (commute is 3 miles round trip), 160* thermostat (yikes), and extremely dusty environment
- AC Delco oil filter
- K&N "cold air induction"...primary reason for analysis

Code
RICARDO: We found some fuel in this 0W/20 oil, but just a minor amount. 1.0% fuel is small enough to be
from normal use (e.g. short trips) or taking the sample before the engine is fully warm. With the viscosity
being well inside the 0W/20 range and wear looking good, you can be confident fuel hasn't caused issues.
Averages on the far right show typical 5.3L EcoTec3 wear after a ~6,700-mile run. Aluminum through
copper are the wear metals and they're actually a little better than we'd expect after a 5,200-mile run. No
issues stand out for this young Silverado.

Aluminum - 1
Chromium - 1
Iron - 10
Copper - 24
Lead - 0
Tin - 0
Molybdenum - 137
Nickel - 0
Manganese - 4
Silver - 0
Titanium - 0
Potassium - 1
Boron - 28
Silicon - 17 (Happy with this. The K&N filter seems to be doing a decent job.)
Sodium - 4
Calcium - 1234
Magnesium - 457
Phosphorous - 687
Zinc - 771
Barium - 1

Viscosity @210*F - 48.4
                @100*C - 6.79
Flashpoint - [b]365[/b]
Fuel - 1.0 (Strong smell of fuel while changing oil. I thought I had some dilution, but I was obviously mistaken)
Water - 0%
Antifreeze - 0%
Insolubles - 0.2
TBN - Not done



2018 Silverado 5.3L
Re: Dealer Oil / 0W-20 / 5200 miles / 2018 Silverado [Re: Last_Z] #5254387 10/30/19 06:30 PM
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paoester Offline
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Barium? Anybody know what that is for, or is that just a lab noise error (only 1 ppm small)? I didn't think labs tested for that.

It does look like the typical 0w-20 dexos1 currently on the market, with a little more moly here than most.
https://www.bobistheoilguy.com/forums/ubbthreads.php/topics/4833053/ACDelco_0w20_full_synthetic_de

Silicon isn't too high. There is around 10 ppm from just the anti-foaming additive alone. The rest maybe a little normal dust getting in or seal material loose in very small amounts.

If you used Pennzoil Platinum 5w30, a thinner 5w30 on the market, it would fuel dilute in your application down to a 5w20 or 0w20 in no time at all, just saying that is a good option.
It starts out at 9.8 cSt viscosity new, and only has to reduce to 9.2 (not far to go!) to be considered a 20 weight. Thats what I'd use in the presence of a tad bit of fuel dilution.

Re: Dealer Oil / 0W-20 / 5200 miles / 2018 Silverado [Re: Last_Z] #5254398 10/30/19 06:37 PM
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Railrust Offline
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Looks good! I own a 2018 Silverado with the 5.3 and I too have noticed a fuel smell on occasion when I change my oil (5,000 mile intervals).

Interesting thought on going with a thin 5w30 and expecting it to thin to a 5w20 because of fuel dilution...I might give that a try.


2018 Chevy Silverado 5.3
2007 Lexus LS460 (deceased)
2008 Honda CRV
(Whatever synthetic oil is on sale or rebate)
Re: Dealer Oil / 0W-20 / 5200 miles / 2018 Silverado [Re: paoester] #5254406 10/30/19 06:48 PM
Joined: Oct 2002
Posts: 2,794
Last_Z Offline OP
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Funny you mentioned PP 5W-30. I used its cousin for this interval....QS Ultimate Durability 5W-30 with the expectation it would thin out some. πŸ˜‰


2018 Silverado 5.3L
Re: Dealer Oil / 0W-20 / 5200 miles / 2018 Silverado [Re: Last_Z] #5254450 10/30/19 07:33 PM
Joined: Jan 2017
Posts: 484
SteveG4 Offline
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Originally Posted by Last_Z
Funny you mentioned PP 5W-30. I used its cousin for this interval....QS Ultimate Durability 5W-30 with the expectation it would thin out some. πŸ˜‰

It's my understanding that QSUD 5W30 is markedly thicker than PP of the same viscosity.
It is my hope that QSUD doesn't sheer down to a weak 5W30 or a 5W20 in my 5.3L.


Somewhere between Alaska and Wisconsin...
2006 4WD Silverado LT Crew Cab & 2013 AWD Equinox
Re: Dealer Oil / 0W-20 / 5200 miles / 2018 Silverado [Re: Last_Z] #5254751 10/31/19 07:12 AM
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danez_yoda Offline
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Those K&N intakes are knows for not filtering well in the name of airflow. high silicon could be due to that.

i considered one but ran a quick but dynomometer test with and without the stock air intake on my truck. I couldnt really feel a difference so i stuck with stock and the better filtering.


Last edited by danez_yoda; 10/31/19 07:13 AM.
Re: Dealer Oil / 0W-20 / 5200 miles / 2018 Silverado [Re: Last_Z] #5254832 10/31/19 08:54 AM
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cb4017 Offline
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A 160* thermostat??


Cliff
USN Ret., FPD Ret.
Re: Dealer Oil / 0W-20 / 5200 miles / 2018 Silverado [Re: cb4017] #5254834 10/31/19 08:57 AM
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ARCOgraphite Offline
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Originally Posted by cb4017
A 160* thermostat??



Get that out of there! Screws up the tune up and likely the cause of you fuel dilution.

Viscosity is too low with that fuel in there.


2019 VW Jetta S 6MT OCI#2 7378mi-MOTUL Specific VW508.00+VW Service Filter; '17 Subaru Crosstrek CVT OC#9 70254mi-Rotella
Gas Truck 5W20 + Fram Ultra 7317 Filter
Re: Dealer Oil / 0W-20 / 5200 miles / 2018 Silverado [Re: danez_yoda] #5254852 10/31/19 09:10 AM
Joined: Jul 2005
Posts: 34,299
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demarpaint Offline
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Originally Posted by danez_yoda
Those K&N intakes are knows for not filtering well in the name of airflow. high silicon could be due to that.

i considered one but ran a quick but dynomometer test with and without the stock air intake on my truck. I couldnt really feel a difference so i stuck with stock and the better filtering.


I agree, I'd ditch that and the 160F thermostat.


God Bless Our Troops

Re: Dealer Oil / 0W-20 / 5200 miles / 2018 Silverado [Re: Last_Z] #5257512 11/03/19 12:12 PM
Joined: Oct 2002
Posts: 2,794
Last_Z Offline OP
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Team,

I understand your concerns about the t-stat and the K&N system; however, the data does not support your arguments. At least not at this time.

I lived in Florida before moving to New Mexico. Both are nearly extreme hot weather climates. I currently have the truck tuned to 91-93 octane. The best octane I can get right now is 91. One big drawback to the intake is that it sucks hot air. This combination of tune, hot weather and intake can result in pinging if chamber temperatures are allowed to spike. This is the reason for the t-stat.

The intake has absolutely increased responsiveness and power, despite it not being truly cold air. At that, the factory system is MUCH better. Silicon is somewhat high, but the wear numbers are relatively good. The silicon the must be a combination of dust, oil chemistry and residual silicon from the assembly process. Let's not forget this engine only has 20k miles.

Insolubles are very good, water is 0% and fuel is within acceptable limits, especially for direct injection.

The numbers are telling me everything is ok. We'll see what happens during winter.

Ric


2018 Silverado 5.3L
Quaker State Ultimate 5W-30 [Re: Last_Z] #5415972 04/28/20 08:13 PM
Joined: Oct 2002
Posts: 2,794
Last_Z Offline OP
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Hello everyone,

I did a follow-up UOA on my truck last month. Here are some notes for you to consider:

- UOA length: 7090 miles (took the oil life monitor down to 6%). 29,583 miles overall.
- Oil is Quaker State Ultimate Durability 5W-30. I went up in grade anticipating oil dilution.
- M1 oil filter
- 160* thermostat smile2
- Same K&N intake system with a prefilter
- Driving consisted of VERY VERY short commutes. Work is 1.2 miles from my house.

Between the 160* thermostat and the cold temperatures here in Alamogordo, NM; the oil took a beating and sheared down a lot from fuel dilution.

***The first set of comments from Blackstone on top, second set of comments on bottom***

***Values on the left is first UOA, number on the right is second UOA***


Originally Posted by Last_Z
Team,

First oil analysis I post here in more than 13 years.

- 2018 Silverado 1500, Crew Cab, Z71 with the 5.3L (L83) engine
- No idea what oil the dealer used, but should be 0W-20/Dexos 1 as recommended
- 5200 miles on the oil...21,520 overall
- First 3K miles was mostly long trips visiting family and moving out of state. The second half is completely different...short trips (commute is 3 miles round trip), 160* thermostat (yikes), and extremely dusty environment
- AC Delco oil filter
- K&N "cold air induction"...primary reason for analysis

Code
RICARDO: We found some fuel in this 0W/20 oil, but just a minor amount. 1.0% fuel is small enough to be
from normal use (e.g. short trips) or taking the sample before the engine is fully warm. With the viscosity
being well inside the 0W/20 range and wear looking good, you can be confident fuel hasn't caused issues.
Averages on the far right show typical 5.3L EcoTec3 wear after a ~6,700-mile run. Aluminum through
copper are the wear metals and they're actually a little better than we'd expect after a 5,200-mile run. No
issues stand out for this young Silverado.

RICARDO: We mentioned fuel last time and it went up to 2.5%, a little over the 2.0% we deem high (and
that explains the low viscosity). If this result becomes the norm, then there might well be a fuel system issue
to look into. Check for a rising oil level on the dipstick every now and again. If the oil level is fine and you
aren't draining more oil than you put in, perhaps this result was just the by-product of short trips or a lot of
idling. Everything else checks out. A bit more iron is the norm after a longer run (and this level is still better
than average). No coolant or water found.

Aluminum - 1 - 5
Chromium - 1 - 1
Iron - 10 - 20
Copper - 24 - 25
Lead - 0 - 0
Tin - 0 - 0
Molybdenum - 137 - 146
Nickel - 0 - 0
Manganese - 4 - 4
Silver - 0 -0
Titanium - 0 - 0
Potassium - 1 -1
Boron - 28 - 22
Silicon - 17 - 14
Sodium - 4 - 4
Calcium - 1234 - 1197
Magnesium - 457 - 419
Phosphorous - 687 - 623
Zinc - 771 - 726
Barium - 1 - 0

Viscosity @210*F - 48.4 - 50.4
                @100*C - 6.79 - 7.40
Flashpoint - [b]365 - 335[/b]
Fuel - 1.0 - [b]2-5[/b]
Water - 0% - 0%
Antifreeze - 0% - 0%
Insolubles - 0.2 - 0.2
TBN - Not done - Not done



2018 Silverado 5.3L
Re: Quaker State Ultimate 5W-30 [Re: Last_Z] #5415978 04/28/20 08:21 PM
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mpack88 Offline
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Why such a cool thermostate?

Re: Quaker State Ultimate 5W-30 [Re: mpack88] #5418188 05/01/20 11:51 AM
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Posts: 57
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mahanddeem Offline
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Posts: 57
Originally Posted by mpack88
Why such a cool thermostate?

Not good I agree, 185 is minimum!

Re: Quaker State Ultimate 5W-30 [Re: Railrust] #5419777 05/03/20 09:01 AM
Joined: Jul 2005
Posts: 13,139
dave1251 Offline
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Posts: 13,139
Originally Posted by Railrust
Looks good! I own a 2018 Silverado with the 5.3 and I too have noticed a fuel smell on occasion when I change my oil (5,000 mile intervals).

Interesting thought on going with a thin 5w30 and expecting it to thin to a 5w20 because of fuel dilution...I might give that a try.

According to a esteemed former GM Engineer this is necessary.


make the inside of your engine oil cap white.
don't use.
Re: Quaker State Ultimate 5W-30 [Re: Last_Z] #5419783 05/03/20 09:07 AM
Joined: Jul 2005
Posts: 13,139
dave1251 Offline
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https://www.bobistheoilguy.com/forums/ubbthreads.php/topics/4904365/2

Members on this site can't stop looking for problems. I have the correct answer for you. If you are convinced there is a "problem" there will be a problem even when there isn't a problem.


make the inside of your engine oil cap white.
don't use.
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