Originally Posted By: OVERKILL
Originally Posted By: GM4LIFE
Originally Posted By: wemay
Originally Posted By: GM4LIFE
Just fine. The 0W20 oil is super thin. Just like water. GM admonishes against running thicker oil in their DI truck engines. The oil passages are very narrow and the 0W20 oil is thin enough to flow through properly.
Where can this information be found? The Owners Manual? This is the first time i hear of only one oil viscosity being accepted. Just curious is all.
Yes, the owner's manual is where this info can be found. Historically as far back as the late 80's and early 90's GM has not run any oil thicker than 5W30 due to failures from running thicker oils during R&D testing. GM has stated that it's new DI truck engines have narrow oil passages and the thinner 0W20 oil flows easier through narrow passages and so for that, it is the only approved viscosity for that application. I will try to dig up the section of the owner's manual that states this. My owner's manual (Cadillac CTS-V) states never to run any oil thicker than 5W30 and for cold climates a 0W30 oil is acceptable.
That doesn't sound right. GM runs 0w-40 in their own track program Corvettes....
OW40 is suitable for hard track use, but not for the new DI truck engines. GM's statement in the owner's manual is not vague at all. Here it is!
2014 Chevrolet Silverado 1500 Owner's manual states:
Viscosity Grade
SAE 0W-20 is the best viscosity
grade for the 5.3L and 6.2L
V8 engines. SAE 5W-30 is the best
viscosity grade for the 4.3L V6, and
6.0L V8 engines. Do not use other
viscosity grade oils such as
SAE 10W-30, 10W-40, or 20W-50.
Cold Temperature Operation: In an
area of extreme cold, where the
temperature falls below -29°C
(-20°F), an SAE 0W-30 oil may be
used in the 4.3L or 6.0L engine. An
oil of this viscosity grade will provide
easier cold starting for the engine at
extremely low temperatures. When
selecting an oil of the appropriate
viscosity grade, always select an oil
of the correct specification. See
“Specification” earlier in this section
for more information.
Here is the link to the info, scroll to page 10-12 for verification. I am very well versed in how GM does things.
http://www.chevrolet.com/content/dam/Che...ners-manual.pdf