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Old 10-22-2009, 08:44 AM
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Dominator 15W-50 Racing Oil Product Code: RD50QT-EA
AMSOIL Dominator Synthetic Racing Oil features an additive package heavily fortified with zinc and phosphorus for superior long-term wear protection

So does the ARO, 20w-50
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Old 10-22-2009, 02:17 PM
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Originally Posted by Hydrocruiser View Post
SAE 20W-50 Synthetic Premium Protection Motor Oil Product Code: AROQT-EA

20W-50 Advanced Synthetic Motorcycle Oil Product Code: MCVQT-EA

Dominator 15W-50 Racing Oil Product Code: RD50QT-EA
AMSOIL Dominator Synthetic Racing Oil features an additive package heavily fortified with zinc and phosphorus for superior long-term wear protection

SAE 15W-40 Heavy-Duty Diesel and Marine Motor Oil Product Code: AMEQT-EA

All four Amsoil products would be fine.
All high in ZDP for anti-wear and anti-corrosion.

Fewer oils these days are true GRP IV. PAO Synthetics. But these all are.

Any of these along with M-1 V-Twin and M-1 15W-50 SilverCap are great choices.
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Old 03-31-2010, 09:57 AM
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Default mobil1 v-twin sale

advance auto parts site. mobil1 v-twin 20w-50 7.99/qt. at check out enter promo code PS20 for additional 20% off. that's $6.39/qt. and free ship over $75.00.
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Old 03-31-2010, 03:04 PM
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Originally Posted by smokinbob View Post
advance auto parts site. mobil1 v-twin 20w-50 7.99/qt. at check out enter promo code PS20 for additional 20% off. that's $6.39/qt. and free ship over $75.00.
That is a great price.
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Old 05-02-2010, 03:02 PM
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I was asked to do a brief 2010 lubrication recommendation.

#1. Do not use SM rated oils as they have too little ZDDP. Mobil-1 20W-50 V-Twin is still the one to beat. Royal Purple, Amsoil V-Twin and Redline 20W-50 are amazing as well.

$2.Use a Wix oil filter or Mercury racing oil filter and you will have the best combination.

#3. Mercury 20W-40 Synthetic Blend is an outstanding oil!

#4. If you run hard change often. Synthetic in a boat engine is not for extended drains...it's for better heat protection and extendedbearing life.

#5. Castrol/Kendall/Valvoline SL rated oils 20W-50 are excellent.
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Old 05-02-2010, 04:32 PM
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Originally Posted by Hydrocruiser View Post
I was asked to do a brief 2010 lubrication recommendation.

#1. Do not use SM rated oils as they have too little ZDDP. Mobil-1 20W-50 V-Twin is still the one to beat. Royal Purple, Amsoil V-Twin and Redline 20W-50 are amazing as well.

$2.Use a Wix oil filter or Mercury racing oil filter and you will have the best combination.

#3. Mercury 20W-40 Synthetic Blend is an outstanding oil!

#4. If you run hard change often. Synthetic in a boat engine is not for extended drains...it's for better heat protection and extendedbearing life.

#5. Castrol/Kendall/Valvoline SL rated oils 20W-50 are excellent.
Do you still like 15-50 Silver cap M1? It is so cheap in the 5qt bottles at walmart it is hard to avoid.
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Old 05-03-2010, 12:41 AM
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Hydro - any downside to running Valvoline 40 Racing conventional oil? 540's NA, temp never above 180. Engine builder wants to stay with this oil. Using a Wix filter. Thanks.
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Old 06-14-2010, 12:36 PM
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Originally Posted by Hydrocruiser View Post
I only have a couple minutes to do this today so I will do it quick and dirty....these are products OSO members have used and have enjoyed much success with.

Some go with all Mercury products; others with M-1 or Amsoil and some mix and match.

My personal picks are in bold.


Synthetic oil:
-Amsoil Racing Severe Service 20W-50
-Mobil-1 15W-50 EP
-Mobil-1 20W-50 V-Twin
-Royal Purple 20W-50
-Redline 20W-50

I was wondering if someone could shed some light on the FC-W rated oil.

When I read about oil in our Merc 4986HO Manual they have a note "....., non FC-W rated synthetic oils,.... are specifically not recommended."

What is FC-W rated oil? What does it do?

It seems only Mercury/Quicksilver oil has this rating. A little confused as to why.

Thanks for the help.
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Old 06-14-2010, 01:49 PM
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HydroCruiser -

Any opinions of the Brad Penn 20W-50? A couple of engine builders in the area swear by the stuff, and is currently what I am running.
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Old 06-14-2010, 02:27 PM
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Originally Posted by TW720HVY View Post
I was wondering if someone could shed some light on the FC-W rated oil.

When I read about oil in our Merc 4986HO Manual they have a note "....., non FC-W rated synthetic oils,.... are specifically not recommended."

What is FC-W rated oil? What does it do?

It seems only Mercury/Quicksilver oil has this rating. A little confused as to why.

Thanks for the help.

It's an NMMA certification for oils. Happy reading: http://www.nmma.org/certification/lo...nual_9-06_.pdf

Amsoil Marine has an FC-W rating, maybe others as well. Mercury doesn't have a monopoly on that market.
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