It depends on your climate but in most cases it would take 5W-30.
The oil pressure switch on a 1998 Chevy Blazer is on the side of the engine block. It is located above the oil filter.
The oil cap on a 1998 Chevy Blazer is located on the passenger side of the motor. It is just to the left of the manifold cover.
in the oil pan
5w30
on the back side of the oil pan.
The transmission dipstick on a 1998 Blazer should be located at the rear of the engine. It should not be near the oil dipstick.
5w30
A NAPA 1040 or the NAPA 1036 will do.
Assuming you mean the engine oil drain, it is located at the lowest point on the oil pan and requires a 15mm wrench to remove it.
It depends on the climate but a 5W-30 works in most cases.
on the oil pan...
Oil pan.