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Cadillac STS Forum - 2005 through 2012 Discussion, STS N* v8 MPG in Past Cadillac Vehicle Discussion; Why would you even remotely consider dumping snake oil into your engine ?? ("oil cleaner" ? ? ? ?) Open ...
  1. #16
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: STS N* v8 MPG

    Why would you even remotely consider dumping snake oil into your engine ?? ("oil cleaner" ? ? ? ?)

    Open the oil fill cap and look in there with a strong flashlight. See anything that would make you want to dump in some extra goop that costs money and therefore drives up the cost of mileage - just as non-essential gasoline additives do. What does your (GM) owner's manual say about using additives ?

    Engine oils, straight out of the bottle, already have everything needed to keep your engine clean and happy. Let others buy the junk that puts stickers on the sides of Dale Earnhardt's car.

    For some homework, Google "top tier gasoline".

  2. #17
    Guy.Seminerio is offline Cadillac Owners Connoisseur
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    Re: STS N* v8 MPG

    When I was younger I had a 97 Altima and I bought a can of some oil additive. I happened to be taking my car in for an oil change so I gave the mechanic the can and asked him to add it in and he basically told me I was wasting my time. The stuff doesn't do anything. Ever since then I've been convinced that stuff is all a scam.

  3. #18
    Cadzilla8's Avatar
    Cadzilla8 is offline Cadillac Owners Fanatic
    Automobile(s): 2005 Cadillac STS Northstar V8
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    Reset the avg mpg 50 miles ago now I'm down to 10.2-10.3 c'mon :headroll:

  4. #19
    EChas3's Avatar
    EChas3 is offline Cadillac Owners Master
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    Re: STS N* v8 MPG

    Don't believe the DIC. What is your calculated mpg?

  5. #20
    curtc's Avatar
    curtc is offline OCD - Obsessive Cadillac Disorder
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    Re: STS N* v8 MPG

    I have found mine to be a bit generous at times and sometimes not so generous when calculating my own MPG after filling up.

    Fill her up, reset trip, reset AVG MPG, drive 100m or so and top her off again...Check the DIC's math vs. real math.
    Past Cadillac's

    2004 CTS 3.6L - 2011-2012
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  6. #21
    Cadzilla8's Avatar
    Cadzilla8 is offline Cadillac Owners Fanatic
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    I'm going to do that tomorrow morning as I filled up an hour ago. How many gallons are our tanks 20 or 18? I had little less than 1/8 and it took 15gallons

    ----------

    Could putting 10w oil instead of 5w cause the engine to work harder and give worse mpg? I may have put 10w now that I think back but I'm not certain -____-

  7. #22
    curtc's Avatar
    curtc is offline OCD - Obsessive Cadillac Disorder
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    IIRC 17.6 gallons is the fuel capacity. I'd have to consult the manual to confirm.
    Past Cadillac's

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  8. #23
    EChas3's Avatar
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    Re: STS N* v8 MPG

    If you put in more than 17, you may be getting cheated by the gas station. My 2006 manual says 17.4 and my 2007 manual says 17.5. I've run it low, but don't remember ever putting in more than 17 gallons. (But I don't 'top off'!)

  9. #24
    Midnight is offline Cadillac Owners Fanatic
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    Re: STS N* v8 MPG

    05 1SG (rear wheel drive), with the 3.43 gears, I get about 20 in 75/25 highway/city driving +- 2 (ish).

  10. #25
    3rdcaddy's Avatar
    3rdcaddy is offline Cadillac Owners Member
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    06 AWD N*, 120 K, I get 21 hwy at 85 mph with the cruise set. I can avg 18 normal driving, drops to about 15 when enjoying sport mode.

    Plugs were changed at 80K, original fuel filter

  11. #26
    EChas3's Avatar
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    Re: STS N* v8 MPG

    3RD-That's outstanding! What tires, size & pressures?

  12. #27
    mckellyb is offline Cadillac Owners Enthusiast
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    Re: STS N* v8 MPG

    My 75% highway/25% city commute, which is ultra-predictable Fort Worth traffic, I'm deep into the throttle a couple of times per tank, 87 octane from Costco, same pump, same station every single time, and I get about 20.5-20.6, depending. On light timing and A/C use.

    I track all my MPG, by hand, for all vehicles (save for my wife's current one), since my first 72cc Honda scooter back in 1984, and I can say you should be getting much better MPG.

    I have the 3.23 rear, on Continental Extreme DWS tires, 38 PSI front, 31 PSI rear. Typical highway speeds are 60-65 MPH, gentle acceleration, backing off early for traffic/lights (I used to drive a tour bus for a living, you get very good at being gentle so as not to have any members of a bachelorette party spill their drinks on either themselves...or you), just 'saving' the car/tires/fuel for fun times.

    I've been down in the 17's, but not much above 21.0. I've not taken it on any road trips, though.

  13. #28
    is3_ftw is offline Cadillac Owners Member
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    Re: STS N* v8 MPG

    ^^^^why 38psi in front and 31psi rear? I always put 32-35psi all around.

  14. #29
    EChas3's Avatar
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    Re: STS N* v8 MPG

    Even that's above our tire tags.

  15. #30
    mckellyb is offline Cadillac Owners Enthusiast
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    Re: STS N* v8 MPG

    Recommended inflation pressures have so many variables, I don't consider pretty much any of them, save for weight carrying, useful.

    Tires, how they're driven, temperature, ride quality, handling expectations, wear expectations, noise, etc.

    I experiment with tire pressure until I find what **I** like, and which performs as I expect, taking my expectations into account.

    I run 38 front, 31 rear because the last set, fronts were excessively worn on both inner and outer edges, decent amount of tread in the middle, yet alignment was fine, and rears wore excessively in the middle, though the PO ran the rears at about 36 PSI.

    edit for grammar

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