[JayJay]

My cynical input:

1. Any oil is better than no oil.

2. Clean oil is better than dirty oil.

3. After that - make a decision and stick with it.

I've accumulated several partial bottles of different oils from the various vehicles that I've had. Now that Model As are my only toys, getting rid of those partial bottles is a desire. My own choice - I use primarily Mobil 1 10W-30 (I buy on sale) when I change the oil, and then top it off between changes with whatever I happen to have around in an open container. Eventually all I will have around is Mobil 1 10W-30, and dino 30W that I use in my oil cans for general lubrication and for the lathe. I don't believe there's any harm in mixing oils in small amounts.

(Oh, I forgot - my air compressor uses 30W non-detergent, so I keep some around to change that oil. And a quart of bar oil for the chainsaw.)

JayJay