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Originally Posted by Bradford
Also I have an older outboard with carbs. *If I just spent three times what my boat is worth on a new engine I'd run what the mfr told me to while it was under warranty. *Engines with efi and fancy oil injection systems I'm sure probably have different requirements.
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youre right carb engines are harder to kill since they run way richer than DI EFI engines, especially the omc's. more fuel and oil equals cooler exhaust temps and more lubrication. with the oil inj systems you are pretty much good untill you go to DI inj, then i would switch to low ash high detergency primarily to keep the plugs and injectors cleaner longer.