230 Oil Change - Everyone has an opinion

['68OrangeSunshine]

On an L6, with the side-saddle oil filter, pre-filling the oil filter at oil changes is pointless. It will fill about 30 seconds after you crank the starter if your distributor is cranking the oil pump properly, and there it is. Pre-filling the filter could spill some oil on the deck, and then you'll have to clean it up. I just dip my finger in the clean oil and moisten the rubber gasket on the oil filter before I spin it on.
As for oil, the old school oil is the best for old school engines. I use Valvoline SAE 30 Racing. It has enough ZDDP already without needing extra additives [which can increase the acidity of the oil]. The viscousity needed can vary with the elapsed mileage. Thicker oil for-more worn rings. 20-W50 might be a good choice if there are a lot of temperature swings in your normal climate.
Check the Owners Manual for oil pan capacity. I have a 292. They have a deeper [6 Qt] oil pan than 230/250s. I would guess 4-5 Qts, but I've only had 292s.