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  1. M

    115 engine noise

    Thanks for the suggestions about lubrication in a 2+2 classic merc 115. I've got engine noise in this motor that is proving hard to diagnose. I hate to think that it's a bearing (2003 motor) but not sure what else creates a "rattle" from idle to about 2500rpm and sometimes when I back off the...
  2. M

    2+2 concept 2003 115 merc

    How do the "sleepy cylinders" and main bearings get lubricated when the engine is running below 1800 rpm? How long has this system been in the merc lineup and is it still?
  3. M

    single point oil injection

    Our 2003 115 classic merc 4 cylinder has a single point oil injection system according to literature I've read. Does it inject into the fuel lines prior to entering the cylinder? How is this different from the 2 point injection systems of the Optimax? No computer to monitor demand?
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