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What type of motor 10W30 or 10W40 is best used in a 2003 Chevrolet silverado?
Wiki User
∙ 15y ago
If you look at your oil filler cap it says to use 5W30 oil.
Factory said to use 5W30 and 10W30 in the summer time / Hot weather.
If you use heavy weight oil the valve train will not lube correctly and it will burn up the roller lifters and rocker arms. You will loose the valve train.
Wiki User
∙ 15y ago
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