Recent Topics
Adding fuel filter- Generator built with no filter
by rubberchicken. 09/23/18 09:57 PM
Clutch Engaging too low
by Spetz. 09/23/18 09:41 PM
SMA - Krown previously, Fluid Film Application
by StevieC. 09/23/18 09:21 PM
First Paint Correction
by RayCJ. 09/23/18 08:33 PM
2011 Dodge Caliber
by dogememe. 09/23/18 07:48 PM
Mixing transmission fluids - partial change
by spk2000. 09/23/18 07:31 PM
Counterfeit MANN filter???
by IllinoisSparky. 09/23/18 06:54 PM
The smell of an oil: VME adds?
by fdcg27. 09/23/18 06:48 PM
Classic road brake pads
by buck91. 09/23/18 06:18 PM
Air up your vehicle's tires
by Papa Bear. 09/23/18 06:07 PM
A cool litttle Fall foliage site
by Papa Bear. 09/23/18 06:02 PM
Suggestion: "Likes"
by SnowDrifter. 09/23/18 05:36 PM
Condensation in headlights?
by irv. 09/23/18 05:06 PM
Nissan VQ V-6 Engines
by Al. 09/23/18 04:57 PM
List of dexos licensed oils?
by k1xv. 09/23/18 04:24 PM
High flow oil pump? Thinner oil?
by SnowDrifter. 09/23/18 04:06 PM
Is Tiger back?
by gman2304. 09/23/18 03:51 PM
Newest Members
Lilshady, SevenDu, sigpro, RayCJ, yellow97tt6spd
66055 Registered Users
Who's Online Now
78 registered members (4WD, antonmnster, alphadog, 408lsxs10, aquariuscsm, 92saturnsl2, 10 invisible), 1,485 guests, and 32 spiders.
Key: Admin, Global Mod, Mod
Forum Statistics
Forums67
Topics290,917
Posts4,852,459
Members66,055
Most Online3,590
Jan 24th, 2017
Donate to BITOG
Previous Thread
Next Thread
Print Thread
Hop To
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: 966
SF BAY AREA, CA
dogememe Offline
dogememe  Offline
Joined: Apr 2017
Posts: 966
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.


2007 Crown Vic P71 4.6 ~127K Miles, RP HPS 5W-30, RP 20-820, Daily Driver.
2010 Escape FWD 2.5 ~90K Miles, Castrol Edge EP 5W-30, Wix 51348, Rented on Turo.
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: 7,984
Cincinnati, OH, USA
bullwinkle Offline
bullwinkle  Offline
Joined: Oct 2004
Posts: 7,984
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: 7,001
Texas
4WD Online confused
4WD  Online Confused
Joined: Sep 2010
Posts: 7,001
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: 5,387
Fort Lauderdale, FL
DoubleWasp Offline
DoubleWasp  Offline
Joined: May 2012
Posts: 5,387
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: 7,001
Texas
4WD Online confused
4WD  Online Confused
Joined: Sep 2010
Posts: 7,001
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: 7,001
Texas
4WD Online confused
4WD  Online Confused
Joined: Sep 2010
Posts: 7,001
Texas
And brown with overcast sky



BOB IS THE OIL GUY® Powered by UBB.threads™