OVERKILL
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Originally Posted By: GM4LIFE
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
That doesn't say anything about it causing damage though or narrow oil passages. Ford has similar statements about running 5w-20 in the Modular and then spec'd 5w-50 for the Track Pack version of the same engine, LOL.
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
That doesn't say anything about it causing damage though or narrow oil passages. Ford has similar statements about running 5w-20 in the Modular and then spec'd 5w-50 for the Track Pack version of the same engine, LOL.