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Re: OptiMax ProXS oil [Re: Frank the Tank] #13458560 03/03/20 01:05 PM
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Common debate and I think any TC-W3 two cycle is probably fine but I have always felt comfortable using the Mercury DFI two cycle with its additives in my Merc 250 Pro XS. Best(most affordable) place I’ve bought it is Rockwall Marine. They carry it in bulk and fill their own gallon jugs for sale. Way cheaper than any retail I’ve found. Not convenient but once a year or so when I’m east of Dallas I run by and stock up on a handful of gallon jugs.

Moritz Chevrolet - 9101 Camp Bowie W Blvd, Fort Worth, TX - Monte Coon (817) 696-2003
Re: OptiMax ProXS oil [Re: Frank the Tank] #13458624 03/03/20 02:07 PM
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Wally World in Azle has been carrying the Quicksilver DFI oil for around $39.00 a gallon
Bought 2gallons Sunday

Last edited by blacklab; 03/03/20 06:45 PM.
Re: OptiMax ProXS oil [Re: dflipper] #13458636 03/03/20 02:18 PM
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Originally Posted by dflipper
As long as it is Tcw-3 qualifies you are ok. I run different ones in mine and have been since 2008, mainly pennzoil. Mercury doesn’t own a refinery, the oil comes from the same place. If your going to run an expensive oil I would chose Lucas or Ams-oil.

It doesn't ALL come from the same place but your right there are just a few refineries and many brands come from the same place, my 2cents after discussing brands with someone that works in the petro industry go with quicksilver premiumplus/DFI (same as mercury) or penzoil premium plus/XLF

Re: OptiMax ProXS oil [Re: Frank the Tank] #13458764 03/03/20 03:51 PM
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Originally Posted by Frank the Tank
anyone using Quicksilver Premium Plus with their ProXS? I have been using The OptiMax DFI oil you get at a dealer but sometimes it's hard to get to a dealer.


I've been using Premium Plus in my ProXS for 7 years and no issues. Just recently replaced original spark plugs that still looked fine. I spend $19.95 per gallon at Academy....

Re: OptiMax ProXS oil [Re: Frank the Tank] #13458781 03/03/20 03:59 PM
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Doubt it makes a huge difference, but I'm going to use what the manufacturer recommends. I've used both Mercury/Optimax DFI (it's the same stuff as previous poster's said) in my Optimax based on availability.


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Re: OptiMax ProXS oil [Re: Frank the Tank] #13458825 03/03/20 04:36 PM
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I wonder why Merc recommends that you use their DFI oil? Maybe they make a nice lil profit off of it? I only run the DFI oil but I really and truly believe its all the same chit.They only recommend that you use their oil, never do they say you MUST use it. Have buddies who only run Quicksilver and they are fine. Eventually they all blow up no matter what oil you using.

Re: OptiMax ProXS oil [Re: Frank the Tank] #13458880 03/03/20 05:26 PM
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Almost nobody uses what the manufacturer recommends in their car.
Motorcraft and Mopar and ACDelco all surely make fine oil but its just a marked up average oil.

Same with 2 cycle motor oils. Ask a rebuilder who's rebuilt hundreds or thousands of them and they will mostly tell you that motor oil is usually not the reason the motor failed.

By the way, DFI oil was not even available till several years after they started making the Optimax. Also....
MERCURY DFI OIL IS NOT TCW3 RATED.

I used Pennzoil Premium Plus for years but have not owned a direct injected motor for a couple years.


Re: OptiMax ProXS oil [Re: Frank the Tank] #13458882 03/03/20 05:26 PM
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I use the Mercury DFI Synthetic blend. Whats best place to buy that around DFW only place i seen it was 40$ a gallon.

Re: OptiMax ProXS oil [Re: Allison1] #13458914 03/03/20 05:39 PM
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Originally Posted by Allison1


By the way, DFI oil was not even available till several years after they started making the Optimax. Also....
MERCURY DFI OIL IS NOT TCW3 RATED.




Yeah they came out with it after those engines earned the nickname Opti-Pop!

Re: OptiMax ProXS oil [Re: Frank the Tank] #13458932 03/03/20 05:52 PM
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The DFI synthetic blend is designed to be more easily "atomized" during injection, and to burn quickly and completely. Simply more suited for direct injection engines. Just buy the quicksilver brand DFI, if you choose, (I don't), but bulk is the way to save money/ re-use jugs. Just because a motor doesn't blow up using it, doesn't mean it's the optimum for it.

Re: OptiMax ProXS oil [Re: Frank the Tank] #13458954 03/03/20 06:07 PM
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Except mercury states DFI oil is optimum for Optimax, not using it leads to more carbon deposits in the engine which leads to boom

Last edited by SC-001; 03/03/20 06:09 PM.
Re: OptiMax ProXS oil [Re: Frank the Tank] #13458977 03/03/20 06:23 PM
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DFI came about mostly because so many were spending lots of time idling around when side imaging came out. Idling is where these engines run the dirtiest. Mercury Racing recommends Premium Plus
or Merc. Racing oil (very expensive), not DFI. I believe they assume the racing crowd will not be idling much.

Re: OptiMax ProXS oil [Re: Frank the Tank] #13459003 03/03/20 06:41 PM
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Amsoil HD Marine problem solved . Lower unit gear oil also.

Re: OptiMax ProXS oil [Re: Frank the Tank] #13459035 03/03/20 07:02 PM
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My understanding is the DFI oil has a better additives package than Premium Plus to help combat carbon build up. Again, I asked from a standpoint of needing oil in a pinch, but will continue to use DFI oil when available.


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Re: OptiMax ProXS oil [Re: Frank the Tank] #13459097 03/03/20 08:02 PM
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When my powerhead went out Chuck at service told me if you weren't using Premium Plus in a 225 or 250 that the warranty was void. That's what he sells and I believe he and Perry are the experts so I use Premium Plus.

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