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Towncivilian

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Posts posted by Towncivilian

  1.  

    Well per the owners manual it says if the ambient outside temp anticipated before the next oil change is zero and above 10W30 or 10W40 is ok

    10W-30 or 10W-40 is acceptable above 0F but there is no benefit over 5W-30 in the vast majority of cases.

  2. One thing that struck me was that I put 10w30 full syn in prior to a road trip in some extremely hot conditions last summer (115F in Moab, early July for example). I'm about due for an oil change and will be going w/ the typical 5w20 full syn, but could having such thick oil really bog the motor down that much? I mean once it's warm, it's warm. normal viscosity should return at proper operating temp, and I was consistently getting 15-19mpg on the freeway the entire road trip - over 1500 miles - with about 500# of gear in back, bikes on top, and two adults inside.

    No. It would not make a noticeable, measurable difference. 5W-20 is also not specified for our engines, use 5W-30 year round.

  3. Your 02 sensors. 4 of them, two before the main cats, two after. There are a second set of cats aft of the rear O2s. But having a shop remove them will probably NOT happen. As it's illegal. But it is possible usually with a cash only place *cough*cough*.

     

    There are actually two "pre-cats" close to the exhaust headers, then the typical main cats you would expect afterwards which are monitored by the rear O2 sensors. At least, this is the case on VQ35DE R50s.

  4. I run some fuel treatment through in the first couple of weeks of having it. I was getting worse, like theexbrit.

    Not all fuel treatments are effective. Those containing PEA (polyether amine) are the most effective and is also what is found in top-tier fuels (Chevron, Shell, Mobil, etc). Fuel system cleaners containing adequate amounts of PEA are Chevron Techron (not the "ProGard fuel injector cleaner"), Gumout Regane, Redline SI-1, CRC Guaranteed To Pass (not worth the higher price over the others), probably one or two more I'm missing. I'd go for Gumout Regane from Walmart since it's the cheapest and is equally effective as Techron.

  5. Bosch is the original sensor supplier.

     

    Bank 2 is driver's side on R50s! Bank 1 is the side with cylinder 1 (passenger) and bank 2 is the side with cylinder 2 (driver).

     

    Get this sensor from AAP, throw in a PureOne PL14610 oil filter and use coupon code TRT37 and get it all for $45.08 before any applicable tax. Pick-up in store.

    • Like 2
  6. No reason to use Royal Purple oil over anything else. Pennzoil has big advertising about their oils keeping engines cleaner, so try any of their oils for a while. Mobil 1 HM and just about any other high mileage oil will have a lot of detergency additives as said above.

     

    OBDII will complain if you remove the rear oxygen sensors and the cats. You shouldn't touch the cats unless they're clogged, the ECM is designed to operate with them present and I doubt you will gain any fuel economy by their removal.

     

    Use synthetic 75W-90 gear oil in the rear differential and front (if applicable). Use synthetic ATF (Valvoline MaxLife is great and is relatively inexpensive) in the transmission transfer case, and power steering. Ensure tire pressure is correct. Run a 20oz bottle of Chevron Techron fuel system cleaner through a tank of gas, then change the fuel filter. Change engine air filter if not done recently. Don't use anything higher than 89 octane. Drive less aggressively.

    • Like 1
  7. Which model # Wix?

     

    Try a filter with a silicone anti-drainback valve, if you haven't yet (usually orange colored), in no particular order: Purolator PureONE, NAPA Gold (Wix rebrand), Fram ToughGuard / Ultra, Bosch Premium (PureONE clone)

    Nitrile (usually black) on the cheaper filters sometimes does not seal as well and can become brittle and hard after repeated heating/cooling cycles, resulting in oil draining out of the filter and causing startup rattle/noise.

     

    The Lucas crap is basically SAE 140 gear oil with zero additives - all it does is thicken the oil and dilute its additive package. If you want a thicker oil, use a thicker oil instead of putting gorilla snot in it. It's fine for this oil fill, but I would strongly suggest discontinuing use after this oil change.

  8. added a bit of Lucas oil additive to help get rid of the knock that showed up 2 weeks ago

    Lucas oil additive will only thicken the fluid and provide no benefits; in effect, it will only mask the noise so you can't hear it.

     

    How many miles do you have on the current oil fill & filter? What oil and filter are you using? What are the current temperatures in Nevada? Does the knock happen when cold and hot (i.e. does it ever go away)? How many miles on your Pathfinder?

  9. Used oil analysis won't detect blow-by.

     

    I'm not sure about your second question.

     

    The gaskets (TB, two UIM gaskets) are supposed to be replaced per the FSM, but they are metal-backed so if they're in good condition I can't see why you couldn't reuse them after cleaning them and the mating surfaces.

     

    If one or more power valve screws are missing, there may be engine damage or catalyst damage or probably both since you are consuming so much oil.

     

    PCV is buried under the LIM and you *have* to take it off. So if you're tackling the PCV, do the threadlocker on the power valve screws with it off the vehicle so it's much easier.

  10. You don't have to remove too much crap to at least examine the power valve screws, just the upper intake manifold. If you are flexible enough maybe you can even apply threadlocker to all of them without removing the LIM; I knelt on the radiator core support to do so but I'm a small person.

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