Correct! Mixing oil is the only way to go. I also believe in a water pressure gauge. The tell tale stream only works to alert you of a problem if you happen to be looking that way. The water pressure gauge is the cheapest gauge on your console and can save you much money. I've had one on every motor since an ice bag was caught on my lower unit 45 miles offshore. The hot alarm went off seconds after a piston siezed.
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