Only the o-rings.
A little lubrication (motor oil) on the o-rings will make assembly much easier.
Never use Motor oil on a BB gun. It will eventually ruin the seals and O-Rings.
it is located at the left rear of the engine block. it is held in with a bolt. make sure you replace the o-rings, and lube the o-rings with engine oil.
most likely bad o-rings or injector
I had a big oil leak in my 93 4.3 Blazer when I bought it and it turned out to be the remote oil filter block on the engine where the oil filter normally would go. There was a big O-Ring that was broked allowing oil to leak past it. I got an oil cooler repair kit from NAPA and it had the O-Rings to replace the broken one plus the oil line O-Rings. I had to remove a strut that went between the oil lines and remove the oil lines from the adapter so I could remove the adapter from the car to clean it and replace the O-Ring in the block.
because the oil rings in those cylinders are worn.
new o-rings coated with A/C PAG oil
Standing in front of vehicle, it is on top and just to the right of the plastic engine cover. Round cylinder about the size of human fist. Use your hand and unscrew. One of the easiest oil filters to access in all of automobile land. The O rings are located on the stalk going from largest at the top to smallest on the bottom. Remove and replace with new.
Get New piston rings!
The filter is made for more than one application, the old filter had to have some kind of seal on it or the oil would have leaked out. Match one of the new o rings up to the old one and use it on the new filter. Buy oem parts next time and you wont have this problem.
1. Remove the intake manifold. 2. Remove the bolt and take the CSP off. 3. Inspect the O rings for damage. Lubricate them with motor oil.