The 3.1/3.4/3.5 are known to have lowe intake manifold gasket issues. If this gasket goes, water from the cooling system goes right into the oil, mixes, and turns the oil into a chocolate milk looking fluid.
That is an indication that head gasket is leaking. yes!
Maybe oil passage leak by gasket in timing cover
I have a 1969 Jeepster Commando with a Buick 225 V6, the forerunner to the legendary Buick 231 V6 still used today, with a Duetsch D431 oil filter. It will probably fit any Buick V6 ever made.
How do you replace the water pump and where is it located on a 1996 Buick Skylark V6
On the rear or side of the oil pan
4.5 quarts for the V6.
The Buick, Chevy or Ford 3.8 V6, it makes a difference.
5 QTS
If it has a four cyl engine it takes 4 qts of oil, if its a v6 it takes 4.5 qts of oil.
Any major brand 10w30 high detergent oil.
Around 40 psi when at at operating temp.
Look at the rear of engine right side