<table width="90%" cellspacing=0 cellpadding=0 align=center><tr><td>Quote, originally posted by EuropeanAM »</td></tr><tr><td class="quote">Effective October, 2010, Mercury has "officially" announced a change in it's oil recommendation for the entire line of ProXS Engines.
Due to a better additive package (that helps to decrease carbon buildup), OPTIMAX/DFI oil is now recommended for ALL ProXS Engines.</td></tr></table>
"Entire Line" and "ALL ProXS Engines" does indeed indicate that the recommendation is RETROACTIVE to prior years.