The 5.7 liter engine in the Suburban is famous for bad intake gaskets. They use a plastic gasket frame with o-rings around the ports. These typically fail around 100k miles. And usually in the front or rear of the engine. I would initially check for a bad intake gasket. If that is not found then proceed to the head gasket or possibly a cracked head. Although the cast iron heads on these models very rarely crack.
5W30 oil.
For a 2003 Chevy Suburban (all engine sizes), the recommended viscosity is 5W30.
80W90 gear oil.
85W90 gear oil.
6 quarts of oil.
Check your oil, if it looks abnormal, like chocolate milk, that means there is water in the oil, your head is cracked.
No we cannot mix water with oil.
ph3506
The Oil filter in under the motor of the truck..
Oil will not mix with water.
where is the oil pressure switch on a 1999 chevy surburban
5 QTS. with new filter.