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PCM 6.0 oil

CentCent Posts: 177 Baller
What oil does PCM recommend for the 6.0 with 409 hp.


  • BdeckerBdecker Posts: 289 Solid Baller
    I run royal purple 15/40 full synthetic. Order it on Amazon.
  • GloersenGloersen Posts: 984 Crazy Baller
    edited September 2019
    Royal Purple 15w-40 Duralec Ultra CI-4+/SL (1350 ppm ZDDP)
    (non CAT)
  • dbutcherdbutcher Posts: 359 Solid Baller
    PCM's owners manuals for several years are on its website.
  • j2nhj2nh Posts: 63 Baller
    PCM Service Bulletin from July 2019.

    This is a change for 6.0L, 6.0L HO, 7.4L SLX, 6.2 L Supercharged, 5.3 DI and 6.2 DI engines.

    Dexos Gen 2 5W-30 All Temperatures.

  • HortonHorton Posts: 28,761 Administrator
    edited September 2019
    I was told to use the Pennzoil Platinum full Synthetic. 5 -30 or 10-30. I'm not a mechanic .... you might want to double-check with your local dealer.
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  • Jody_SealJody_Seal Posts: 2,901 Mega Baller
    I use the royal purple in my big hp engines.
    However it gets real expensive when you have to change oil every 50 hours.
    We put 300 hours a year on a boat. At over $9.00 a quart that's big money for an oil change. Down side to Royal purple is dont let it sit In the pan for long lengths of time without cycling the oil pump.

    I have been Running 15-40 rotella in my 09 6.0, it now has over 1500 hours on it with no issues whatsoever. Dont know that I want to change to a lighter weight oil now.
    Hobby Boats can be expensive when the hobbyist is limited on their own skill and expertise.

  • RichardDoaneRichardDoane Posts: 4,334 Mega Baller
    Viscosity change is driven by the recent warranty issues with the oil pump on those engines
    BallOfSpray Pacific Northwest Vice President of Event Management, aka "Zappy"
  • BrennanKMNBrennanKMN Posts: 517 Crazy Baller
    edited September 2019
    Any SN or SM API spec 15w40 oil for the older non-cat engines. At 50 hour drain intervals the oil is changed long before its useful life is up be it conventional or synthetic.
  • dshockdshock Posts: 26 Baller
    Can someone provide a link for the service bulletin? I searched for it last night without any luck.
  • skiinxsskiinxs Posts: 571 Crazy Baller
    Just checked the PCM website and the manuals for the 2020 engines are now available. sure enough, now recommending Dexos 2 5w30. No more searching for the crazy combination of 15W40 diesel oil with the SM gas certification that oil makers have been dropping.
  • CentCent Posts: 177 Baller
    PCM web page recommends 15w 40 conventional oil for all of their engines other than the XR7 and XS7; for the last two engines they recommend 5w30 synthetic.

    So the conclusion is the 6.0 should have 15W 40. They recommend conventional oil in the manual; apparently on the basis that full synthetic has not been shown to have a benefit; they do say synthetic can be used but it is not a basis to extend the time between oil changes.
  • skiinxsskiinxs Posts: 571 Crazy Baller
    @cent that was the old recommendation. Look at the 2020 manual and specs on Pcm web site.
  • A_BA_B Posts: 4,228 Mega Baller
    Since Mobil 1 was first available in the 1970's, I run synthetic in everything I own that doesn't have oil mixed in the gas. Saves valves and carbon buildup like you can't believe. I would not change out at 50-hours except for the first oil change on a new motor. Mobil 1 ain't what she used to be, but Pennzoil and others consistently test pretty good.
  • Ski_DadSki_Dad Posts: 432 Baller
    edited September 2019
    Oil weight is confusing for me as well. I have an LS1 and they originally specd 15w40 (Indmar) but I've been told I can run 5w30 as well. It would be running 5w30 in a Corvette or Camaro.

    Still running 15w40 but I would think 5w30 would help more on those cold morning starts.
  • A_BA_B Posts: 4,228 Mega Baller
    The first rating is just the cold weather viscosity. So if it says 15W and you are running 5W, it just means the oil will flow through the engine faster at startup, which I don't think is a bad thing. The 40 vs 30 just means at 212 degrees F that the 40 is a little thicker. Again, the 30 will run through the engine faster, taking heat with it, so I don't think that is bad either. I think the general rule my Dad taught me a long time ago is if it was calling for 30 oil, don't go heavier with 40 or 50 weight oil. It would slow the engine circulation as designed, cause more heat and harder on the engine to turn it. Not a technical definition, but just what I have always done for about 45 years....

    By reading some of these engine specs, you would think the engineers looked for the most rare oil in the world and used that as the spec, just to be a pain.
  • CentCent Posts: 177 Baller
    Thanks sschok
  • Pat MPat M Posts: 721 Crazy Baller
    So for me, the challenged in knowledge of these matters, the Dexos Gen 2 is synthetic?
  • skiinxsskiinxs Posts: 571 Crazy Baller
    @Pat M Yes, only synthetic can meet that standard. I think the "2" designation is aimed At diesels . Not sure on that one though.
  • KelvinKelvin Posts: 1,187 Mega Baller
    There’s Dexos1 Gen2 with a green logo, DexosD with an Orange logo for Diesel and Dexos2 with a blue label (this is the new one in the PCM spec).

    Kelvin Kelm, Lakes of Katy, Katy Texas
  • E_TE_T Posts: 622 extraterrestrial trouble maker
    @Jody_Seal have you ever sent off for a used oil analysis? It would be interesting to see how the motor is warring. Amsoil> Royal Purple.
    E.T. phone home!
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  • Alberto SoaresAlberto Soares Posts: 314 Solid Baller
    edited September 2019
    My 2010 6.0, 1500 hrs, is running perfectly, 15W40 twice a year and only E25 Gasoline. Changed 1 air sensor many years ago and recently the water pump.
  • BrennanKMNBrennanKMN Posts: 517 Crazy Baller
    edited September 2019
    @Alberto Soares There are a lot more people out there that like to spend time thinking about the best motor oil, the highest rated filter or what type of gas to use rather than actually putting hours on a boat.
    I almost find it comical after a certain point.
  • EricKelleyEricKelley Posts: 296 Crazy Baller
    It can be a big deal in the new engines. If you use one of the high zinc oils that used to be preferred years ago in a catylitic converter engine you will have failure of the cats. With only 4 quarts of oil in engines that consistently run near there capacity it is smart business to choose wisely. Then put a ton of hours.
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  • DWDW Posts: 2,110 Mega Baller
    I have always found it interesting that a heavier viscosity oil is spec'd for an engine that runs ~180 degree F oil temps / ~160 degree F water temp compared to similar ones that run 220+ F oil temp and 210 F ish water temps all day long. There is a huge safety factor established for the marine stuff. I would bet it would be really hard to find a tournament ski boat that actually had an oil quality failure.

    @Jody_Seal - why do you have to do a frequent oil circ w/ RP?
  • skihackerskihacker Posts: 344 Baller
    @DW I've always suspected this has more to do with the fact that most marine engines run constantly at higher rpm's. The average car these days runs down the highway at 1000 rpm, boats often live at 3-4000 rpm.
  • blakeyatesblakeyates Posts: 164 ★★★Triple Panda Award Recipient ★★★
    I believe the heavier Vis is due to offset of fuel dilution as idle and heavy throttling creates this dilemma. The heavier Vis oil helps to offset this as the fuel is pulling the viscosity down some.
    Blake Yates
    Nautique Promo Rep, GA
  • KelvinKelvin Posts: 1,187 Mega Baller
    Well, ever since I read the service bulletin, I have been looking in various auto parts stores for Dexos 2 oil with the blue Dexos label. Walmart carries Pennzoil Platinum Euro L 5W-30. That is the only place I have found any oil with the new Dexos2 label. Also, the naming GM used for Dexos, Dexos1, Gen2 and Dexos2 is very confusing. Many workers in the auto parts stores don't know or appreciate the differences. I don't know if GM could have made it more confusing.
    Kelvin Kelm, Lakes of Katy, Katy Texas
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