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236eagle

08-14-2013 01:09 PM

502mpi oil Consumption

It has been suggested in this form that I use ZDDP based oil to stop my oil consumption. Does anyone have any thoughts on this. Thank you

Hook'em

08-14-2013 02:15 PM

No opinion (or knowledge) on the ZDDP, but wondering how much you're burning? My high hour 502 burns a quart about every 20 hours, running Merc 25/40 conventional.

johnny b good

08-14-2013 04:09 PM

I'm at 740 ish hours on mine and they use the same as when I got the boat with 230 hours. I hear they have low tension piston rings so that's why they use oil. Also the higher rpm you run them the more oil you will use. A quart every 10-20 hours depending on use is what I see with merc 25w-40

minxguy

08-15-2013 06:12 AM

Zinc has nothing to do with oil consumption.

Zinc is an additive used for anti-wear and as an anti-oxidant.

Ken

minxguy

08-15-2013 06:13 AM

You didn't say what you are using for oil, but going to a heavier viscosity will help slow consumption down.

Ken

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