5w30 unless you leak massive amounts of oil, then I would put 10w30.
10w-40.
Read what it says on the OIL filler cap....
Remove engine oil pan
oil is thinner when its hot, that's why.
Underneath the engine block.
oil leaks
Underside, near oil pan.
oil is thinner when its hot, that's why.
heavy duty gear oil
80 or 85W90 gear oil.
Should be listed on the oil cap and in your owner's manual. I think you will find it is 5w30.
A 96 Chevy Beretta Z26 has a 3100 V6 engine. The oil drain is located on the bottom of the oil pan, on a slight angle pointing down and towards the rear.