We use 40 weight in winter and 50 in the summer. The new 20/50 oil should work just fine. The choice is totally up to you.
engine and primary share the same oil on the 1976 sportster,due to engine oil sumps into primary.
20/50
The engine uses three quarts of oil, and the Primary/Transmission uses one quart of Sport-Trans.
The '99 Sportster uses three quarts of engine oil, and one quart of Sport-Trans in the Primary/Transmission.
If it's a Sportster, the capacity is 3us quarts or 2.8L.
Your 1976 sportster holds one quart of fluid. I use HD Sportlube or HD PRI ANDTRANS LUBE, but in the olden days I used a 20 wt non detergent motor oil. This fluid lubes the clutches and transmission gears and primary chain.
probably everywhere, but if you don't find out where the leak is, you may burn up the engine or transmission, so if it stops leaking, you have a problem. FIND the leakand repair it.
Primary oil and transmission are the same. The crankcase is different. They are separated.
what type of oil for a 1993 Harley Sportster 883
there is no need for an engine oil drain plug, because when the oil filter is removed and the oil is drained from the oil tank (by way of the oil tank drain hose located by/under the battery box) there is no oil that remains in the engine.
The engine oil supply holds three quarts. The primary/transmission holds one quart of Sport-Trans.
SAE 20w50 100% synthetic oil.