I put 7 Qts of Amsoil 5W50 Signature Synthetic in my rebuilt 16 engine. Put 7 in, ram it, let it drain back over night then modified my stock original OEM dipstick to read full at that 7qt fresh fill level. Did this so I can keep a good eye on oil level, raising or lowering as each is tell tale of something not right. Low, loosing oil to some where, either burning it, leaking it, or it going somewhere it shouldn’t be. High level either getting fuel contaminated, water contamination from blow by snd oil not getting hot enough to cook it off, or coolant contamination. It’s good to keep a close eye on oil level, it tells you tell tale things if you know what to watch for.