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I recently switched to the Evinrude / Johnson XD 50 oil, I was previously using the XD30. This new oil stinks so bad youd swear there was diesel engine running. Motor is a 40 Evinrude E40ELCCS. Has anyone experienced this at all?
If you have not de-carbed your engine it will. XD-50 contains a carbon treatment that is going to work on the built-up mess in a poorly maintained motor. The best bet is to cut to the chase and do a thorough de-carbon treatment.
I don't see any benefit at all to using DFI oil in a carbed outboard, EN2, except maybe some elitist self satisfaction. Your engine will not run better or last longer.
Any TC-W3 rated oil will work just fine in a 21 year old outboard. Synthetic will run cleaner and make less smoke for 2 or 3 times the price of SuperTech.