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250 Pro XS question

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1hotcougar

New member
Just bought a 2016 boat with a 2016 XS250 with 30 hrs. Previous owner ran Pennzoil Premium Oil in motor. I want to do what is best, but need advise. I've been told to run Mercuty DFI oil by some and told not to change now by others. Confused.
 
You should have received the "Operation, Maintenance & Warranty" manual with the motor and it will specify what oil the mfr recommends. I would use that oil on your almost-new and very expensive motor.

I seriously doubt that changing to the mfr's oil will do any harm to the engine.

I found this info on another site, sounds appropriate:

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.

I expect your manual will say something to that extent as well.

HTH.........ed
 

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If this a four stroke,NO to your question, should i run it low and fill her up with the good stuff. If it is oil injection then YES to your question,BTW,from what i have read & heard penzoil does not have a good track record!
 
I would pull both heads and have them done. If carburated, rebuild YOUR carb and change your fuel pump if mechanical. If fuel injected, clean the injectors and check the pump pressure. Damaged valves are the culprit of high combustion chamber temps. Either from a lean condition or over loaded engine, IE too much prop, bottom growth or your boat is packed with too much gear.
 
Docksidemarineservices said:
I would pull both heads and have them done. If carburated, rebuild YOUR carb and change your fuel pump if mechanical. If fuel injected, clean the injectors and check the pump pressure. Damaged valves are the culprit of high combustion chamber temps. Either from a lean condition or over loaded engine, IE too much prop, bottom growth or your boat is packed with too much gear.
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WOW SERIOUSLY? This engine is a 2016 with 30 hrs.You are scaring me.
 
1hotcougar said:
WOW SERIOUSLY? This engine is a 2016 with 30 hrs.You are scaring me.
Click to expand...

I think he's on the wrong thread. Don't pull your 30-hour-engine apart!!

If you want to effect the change a bit faster than running-down the existing oil, just pump as much of the oil out of the tanks as you can, and refill with the Good Stuff. I read on the Merc website that their oils are miscible with others so I can't see where gelling would be any issue at all.

An inexpensive bellows-type hand pump should do the job.

Again, no need to rebuild the engine yet, I think there may be a few more hour left in the Old Beast!!!! :p
 
I would pull both heads and have them done. If carburated, rebuild YOUR carb and change your fuel pump if mechanical. If fuel injected, clean the injectors and check the pump pressure. Damaged valves are the culprit of high combustion chamber temps. Either from a lean condition or over loaded engine, IE too much prop, bottom growth or your boat is packed with too much gear.



Wow how did this get on here? Ignore this.
 
Well thanks for that scare.....lol......Really appreciated your help guys. Thanks again. I'm going to pump out the Pennzoil and fill her up with DFI.
 
Who decided to run that oil in that motor?? NO NO! Run Quicksivler DFI oil. Whoever put that other stuff in there is a dumbass
 
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