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Royal Purple Duralec 15W-40 Synthetic for Merc 6.2 #4516019
09/14/17 10:50 AM
09/14/17 10:50 AM
Joined: Sep 2017
Posts: 2
PNW
watchthis Offline OP
watchthis  Offline OP

Joined: Sep 2017
Posts: 2
PNW
Hey folks, I have been lurking for a longtime and learned about the benefits of HDEO from this site. I was wondering if anyone has any knowledge or thoughts about using Royal Purple Duralec 15W-40 Synthetic in my 2005 Mercruiser 6.2 MPI? I ask because it is available near my marina at a decent price in gallon jugs. I have not heard much about RP anywhere. Let her rip ....

Re: Royal Purple Duralec 15W-40 Synthetic for Merc 6.2 [Re: watchthis] #4516088
09/14/17 12:03 PM
09/14/17 12:03 PM
Joined: Apr 2017
Posts: 1,789
San Rafael, CA
dogememe Offline
dogememe  Offline

Joined: Apr 2017
Posts: 1,789
San Rafael, CA
Originally Posted By: watchthis
Hey folks, I have been lurking for a longtime and learned about the benefits of HDEO from this site. I was wondering if anyone has any knowledge or thoughts about using Royal Purple Duralec 15W-40 Synthetic in my 2005 Mercruiser 6.2 MPI? I ask because it is available near my marina at a decent price in gallon jugs. I have not heard much about RP anywhere. Let her rip ....


RP gets hate here because their mainstream API gas engine oil is not any better than say Valvoline SynPower at a higher price... however their specialty oils are top-notch and price competitive. If the price is reasonable on that Duralec oil I would not hesitate to run that oil in your application.


2010 Ford Escape 2.5 ~94K Miles: Royal Purple 5W-30 + Wix 51348
2008 Ford Crown Vic P71 4.6 ~167K Miles: AMSOIL SS 0W-30 + Wix 51372
1995 Chevy Silverado 5.7 ~277K Miles: Delo 10W-30 + ACDelco PF52
Re: Royal Purple Duralec 15W-40 Synthetic for Merc 6.2 [Re: dogememe] #4516112
09/14/17 12:33 PM
09/14/17 12:33 PM
Joined: Sep 2017
Posts: 2
PNW
watchthis Offline OP
watchthis  Offline OP

Joined: Sep 2017
Posts: 2
PNW
Thanks for the reply. It is $25 per gallon, and available near my rural marina. It seemed that if I could get a decent full HDEO synthetic for $6.25 per quart close by, it could be a good option.

Re: Royal Purple Duralec 15W-40 Synthetic for Merc 6.2 [Re: watchthis] #4517317
09/15/17 07:00 PM
09/15/17 07:00 PM
Joined: Oct 2004
Posts: 8,736
Cincinnati, OH, USA
bullwinkle Offline
bullwinkle  Offline

Joined: Oct 2004
Posts: 8,736
Cincinnati, OH, USA
I've been using Mobil Delvac 1300 15W40 in my Mercruiser 350 Magnum, it's not full synthetic, but it's usually sub $10/gallon after rebate. Wouldn't hurt to try both with UOA to see how much better the RP is (if any).


06 Ram 3500 CTD 4X4(FG Venturi), 93 GMC C3500 6.2, 89 F-450 7.3, 98 XJ 4.0(XG8A), 05 xB(XG3600), 18 Transit 3.7, 03 Merc Grand Marquis 4.6 2V(XG2)
Re: Royal Purple Duralec 15W-40 Synthetic for Merc 6.2 [Re: bullwinkle] #4517320
09/15/17 07:04 PM
09/15/17 07:04 PM
Joined: Sep 2010
Posts: 8,180
Texas
4WD Offline
4WD  Offline

Joined: Sep 2010
Posts: 8,180
Texas
For the cost of a UOA buy 2-3 jugs of Delvac ... good choice for that motor ...

Re: Royal Purple Duralec 15W-40 Synthetic for Merc 6.2 [Re: watchthis] #4529970
09/30/17 03:59 AM
09/30/17 03:59 AM
Joined: May 2012
Posts: 6,158
Fort Lauderdale, FL
DoubleWasp Offline
DoubleWasp  Offline

Joined: May 2012
Posts: 6,158
Fort Lauderdale, FL
If I were you, I'd look at a high performance 20/50 instead. Gotten best results out of that, but the 15/40 HDEO oils are no joke.


07 Lincoln Navigator M1 0w-40/FU
68 Charger R/T / Supercharged 440 VR1/DBL7349
07 Ram 3500 4x4 / Cummins 6.7 /DBL7349
17 Maserati GranTurismo Cabrio
Re: Royal Purple Duralec 15W-40 Synthetic for Merc 6.2 [Re: dogememe] #4592305
12/02/17 07:16 PM
12/02/17 07:16 PM
Joined: Sep 2010
Posts: 8,180
Texas
4WD Offline
4WD  Offline

Joined: Sep 2010
Posts: 8,180
Texas
Changed my little F60LA 4 stroke today yearly change but very low hours
Royal Purple HPM 10w30 in/out kept Denso filter on

When I drained it you could smell gasoline in the oil
The oil looked dark brown but the iPhone made it Royal again somehow:


Re: Royal Purple Duralec 15W-40 Synthetic for Merc 6.2 [Re: 4WD] #4592851
12/03/17 10:29 AM
12/03/17 10:29 AM
Joined: Sep 2010
Posts: 8,180
Texas
4WD Offline
4WD  Offline

Joined: Sep 2010
Posts: 8,180
Texas
And brown with overcast sky


Re: Royal Purple Duralec 15W-40 Synthetic for Merc 6.2 [Re: 4WD] #4935086
11/25/18 07:20 PM
11/25/18 07:20 PM
Joined: Sep 2010
Posts: 8,180
Texas
4WD Offline
4WD  Offline

Joined: Sep 2010
Posts: 8,180
Texas
Drained the RP HPM 10w30 today … this oil has been discontinued
Filled with Pennzoil Marine 10w30 … FCW product …

Last edited by 4WD; 11/25/18 07:25 PM.
Re: Royal Purple Duralec 15W-40 Synthetic for Merc 6.2 [Re: 4WD] #4935923
11/26/18 03:46 PM
11/26/18 03:46 PM
Joined: Oct 2014
Posts: 13,290
Canyon County Idaho
CT8 Offline
CT8  Offline

Joined: Oct 2014
Posts: 13,290
Canyon County Idaho
I would just run a 15W-40 hdeo or a 20w-50 and let the guilt make you change the oil more often. Marine use is brutal on engines.


2015 Ford F150 2.7
2018 Ford F350 6.2
Re: Royal Purple Duralec 15W-40 Synthetic for Merc 6.2 [Re: CT8] #4935938
11/26/18 04:03 PM
11/26/18 04:03 PM
Joined: Sep 2010
Posts: 8,180
Texas
4WD Offline
4WD  Offline

Joined: Sep 2010
Posts: 8,180
Texas
That PYB marine oil was $5/quart and only takes two ...
Very small low hours motor ... 10w30 works fine for how I run the motor ... 5K to get on plane and 4K after that ... Its just on a small skiff and only fish shallow water ... Short runs ...

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