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Old 18-10-2011, 07:04 PM   #1
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Country: engalnd
Location: south west
Interests: ski racing
Boat name: Jack'd up, hellraiser
Boat make: Bernico 19 ET, ring 16
Engines: merc 135, merc 175, yam 90
Cruising area: Plymouth

Join Date: Jun 2006
Location: south west
Posts: 1,175
150 optimax oil

Read somewhere, think on scream and fly, that you can run premium plus, currently has DFI oil in the tank, but I have over half a 10L tub of premium plus left from my old motor an wanted to be 100% I could. If I cant I certainly wouldn't want to risk it. Have no idea the difference between the two oils but surely theres something apart from the labels.
Thanks in advance for Any help, advice and guidance

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Old 18-10-2011, 11:00 PM   #2
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Country: FRANCE
Interests: speed on water/technics
Boat make: INVADER
Engines: MERC 250XS/SM 1.62
Cruising area: south Britany

Join Date: May 2007
Posts: 538
merc oil

Found this , may be interesting:

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.

Premium Plus still meets the requirement... and is still safe to use, but Optimax/DFI oil is now considered the "first choice" oil. IMHO... the Optimax oil would be of benefit to those that run for extended times at lower RPM's (such as long no-wake zones, extensive side imaging, etc.). Another reason that has contributed to carbon buildup is the introduction of Ethanol into fuel supplies, and this change may help to combat this buildup, ESPECIALLY when combined with regular use of Quickleen.

The following is from the official announcement (courtesy: Mercury Marine):

"Effective October 2010, Mercury OptiMax / DFI or Quicksilver DFI 2-Cycle engine oil is the recommended oil for all OptiMax models - including Pro XS. (The previous recommendation stated the use of Mercury Premium Plus 2-Cycle Outboard Oil in ProXS models and OptiMax oil in non-ProXS models.)

OptiMax / DFI oil is a superior oil when compared to the Premium Plus oil. While both products are high quality 2-cycle engine oils suitable for use in OptiMax engines, the OptiMax / DFI oil contains a higher percentage of additives that reduce carbon deposit formation.

Over time, under normal operating conditions, carbon deposits accumulate in the power cylinder (piston, cylinder head, liners). In most cases the carbon deposits do not create a problem, but carbon deposits that form on the piston - particularly behind the piston rings and piston skirts - can reduce engine life and performance.

OptiMax / DFI oil is specially formulated to prevent the carbon deposits from forming. It also does a better job of reducing existing carbon deposits than the Premium Plus oil. Going forward, the Operation, Maintenance and Warranty manuals for OptiMax outboards will recommend Mercury OptiMax / DFI or Quicksilver DFI 2-Cycle engine oil to help maximize engine life and performance."

if doubt check here:
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