2011 Acadia 3,6L DI ACDelco Dexos 5W-30

Joined
May 28, 2010
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225
Location
Los Angeles,CA
Posting this for someone else. Comments/questions? Report Date: 07/28/14 Unit ID: 11 ACADIA Lab No.: G24522 Fuel Type: Gasoline (Unleaded) Oil Type & Grade: ACDelco Dexos Synthetic Blend 5W/30 Make/Model: GM 3.6L V-6 (LY7) Sample Date: 07/24/14 MI/HR on Oil: 3,079 Miles​​MI/HR on Unit: 31,456 Miles​Make Up Oil Added: 0 qts Comments: Thanks for the notes. You mentioned the oil life monitor said about 43% was remaining and it was probably right; this oil could've seen more use. Universal averages show typical wear levels for this type of GM engine after about 5,300 miles of oil use. You didn't go that long on this fill, which is probably why iron (steel) read lower. It's the only metal that should increase with miles on the oil, while the others remain relatively close to average. The viscosity was low for a 5W/30 and read in the 5W/20 range. The TBN was strong at 3.2, so try 5,000 miles next. Nice!
Code:
ELEMENTS     PPM        UNIVERSAL AVERAGES
ALUMINUM        2           5
CHROMIUM        0           1
IRON           15          23
COPPER          3           9
LEAD            0           1
TIN             3           1
MOLYBDENUM     41          68
NICKEL          0           1
MANGANESE       1          10
SILVER          0           0
TITANIUM        2           0
POTASSIUM       3           2
BORON           8          38
SILICON         8          15
SODIUM         28          48
CALCIUM      2268        1978
MAGNESIUM      22         218
PHOSPHORUS    690         688
ZINC          825         813
BARIUM          0           0
 
 
PROPERTIES.                    Values Should Be*
SUS Viscosity @ 210°   53.0        56-63
cSt Viscosity @ 100°C   8.19       9.1-11.3
Flashpoint in °F      430         >365
Fuel %                 <0.5       <2.0
Antifreeze %            0.0        0.0
Water %                 0.0       <0.1
Insolubles %            0.2       <0.6
TBN                     3.2       >1.0
TAN
ISO Code
 
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Joined
Feb 27, 2012
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3,017
Location
texas
probably one of the better UOAs from a GM minivan in recent memory. 3k seems the safe change interval considering its terrible past results.
 
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Joined
Jul 4, 2014
Messages
119
Location
texas
Low anti-wear additives from appearances (low boron, low-ish moly), and the standard amount of SN-style zinc. The drop in viscosity wasn't due to fuel dilution, surprisingly. Why is this oil shearing down so much in a mere 3k miles? I would suggest trying another oil. I have that same engine in a 2011 Camaro and use Pennzoil Ultra full synthetic due to the engine's fame for being rough on oil *somehow*. I wonder if the insolubles count carbon soot in the oil, although it wasn't much. Soot is supposed to be a problem in our DI engines.
 
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