10w30 is what I would recommend for a 8 year old engine.
On the oil cap it says "5 W 30".
5w30
It is located either on the right or left side of the block depending on model. Low usually close to the oil filter its self.
Yes
motor oil
You didn't say which engine you have but Chevrolet's oil pumps are located inside the oil pan.
trans or oil? oil is in front left. i dont think the 98 blazer has a trans dipstick. Instead, there is a bolt on the side of the trans.
For a 1996 Chevrolet Blazer, the recommended weight for rear differential gear oil is typically 75W-90. If the vehicle has a limited-slip differential, you may also need to add a friction modifier to ensure proper performance. Always check the owner's manual for specific recommendations and any manufacturer updates.
5W30 weight
This sensor is at top rear of engine, next to distributor.
It is probably the oil cooler lines.
Under the front, behind the bumper.