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#4516019 - 09/14/17 10:50 AM Royal Purple Duralec 15W-40 Synthetic for Merc 6.2
watchthis Offline


Registered: 09/13/17
Posts: 2
Loc: 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 ....

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#4516088 - 09/14/17 12:03 PM Re: Royal Purple Duralec 15W-40 Synthetic for Merc 6.2 [Re: watchthis]
dogememe Offline


Registered: 04/15/17
Posts: 692
Loc: SF BAY AREA, 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.
_________________________
1997 Suburban 5.7 ~214K Miles, VWB 5W-30, VO-55, Personal.
2007 Crown Vic P71 4.6 ~124K Miles, VAS 5W-30, RP 20-820, Personal.
2010 Escape 2.5 ~73K Miles, VAS 5W-30, Wix 51348, Rented on Turo.

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#4516112 - 09/14/17 12:33 PM Re: Royal Purple Duralec 15W-40 Synthetic for Merc 6.2 [Re: dogememe]
watchthis Offline


Registered: 09/13/17
Posts: 2
Loc: 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.

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#4517317 - 09/15/17 07:00 PM Re: Royal Purple Duralec 15W-40 Synthetic for Merc 6.2 [Re: watchthis]
bullwinkle Offline


Registered: 10/09/04
Posts: 7719
Loc: 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), 15 Transit 3.7, 03 Merc Grand Marquis 4.6 2V(XG2)

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#4517320 - 09/15/17 07:04 PM Re: Royal Purple Duralec 15W-40 Synthetic for Merc 6.2 [Re: bullwinkle]
4WD Offline


Registered: 09/21/10
Posts: 6527
Loc: Texas
For the cost of a UOA buy 2-3 jugs of Delvac ... good choice for that motor ...

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#4529970 - 09/30/17 03:59 AM Re: Royal Purple Duralec 15W-40 Synthetic for Merc 6.2 [Re: watchthis]
DoubleWasp Offline


Registered: 05/21/12
Posts: 5264
Loc: 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

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#4592305 - 12/02/17 06:16 PM Re: Royal Purple Duralec 15W-40 Synthetic for Merc 6.2 [Re: dogememe]
4WD Offline


Registered: 09/21/10
Posts: 6527
Loc: 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:


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#4592851 - 12/03/17 09:29 AM Re: Royal Purple Duralec 15W-40 Synthetic for Merc 6.2 [Re: 4WD]
4WD Offline


Registered: 09/21/10
Posts: 6527
Loc: Texas
And brown with overcast sky


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