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  1. Variable Compression Turbo Engine? Continuously Variable Valve Timing Duration?

    Mazda6 (Atenza)
    Well that's because the ethanol really IS very knock-resistant, so the blend gives you the "octane" boost. But the real reason for it originally wasn't corn subsidization -- it was from the days of carbs and early TBI engines before we had true closed-loop operation. There it really did matter...
  2. Variable Compression Turbo Engine? Continuously Variable Valve Timing Duration?

    Mazda6 (Atenza)
    For on-road fuel there is an actual mandate for ethanol in the US (called RFS), and it is heavily-subsidized as well. Technically-speaking the non-ethanol fuel is for "off road" purposes but using it in a road car is not the same situation as untaxed off-road (dyed) diesel where you can get...
  3. Variable Compression Turbo Engine? Continuously Variable Valve Timing Duration?

    Mazda6 (Atenza)
    US fuel may be much cheaper but the difference between 87 and 93 isn't in percentage terms. The last time I was in Canada I nearly crapped my pants when it was CAD $60 to fill my "6" up, but that's your "usual expectation" so.... yeah. Even so the difference here is dramatic -- $2.30 for 87...
  4. Variable Compression Turbo Engine? Continuously Variable Valve Timing Duration?

    Mazda6 (Atenza)
    No. There's no possible way in hell you're going to get ~20% more fuel economy. Not a snowball's chance in Hell and anyone claiming you will get anywhere close to the additional fuel cost back in better efficiency is flat-out lying. Mazda's intake VVT is electrical (stepper motor); they also...
  5. Variable Compression Turbo Engine? Continuously Variable Valve Timing Duration?

    Mazda6 (Atenza)
    In a word, no. SkyActiv already accomplishes this with VVT on the intake specifically, with the phaser being electrically driven. That's how they manage to get their sort-of Miller/Atkinson cycle to work, and it also makes piped EGR unnecessary, which reduces complexity while basically...
  6. Synthetic MTX fluid?

    3rd-Gen
    I have seen exactly ZERO issues with running Redline MTL and I'm right near 200k miles at this point. The OE oil was dumped at ~50k and I change it approximately every 50k miles (which means I'm coming up on being due for it again.) The OE fluid came out fairly decent-looking and so have all...
  7. Synthetic MTX fluid?

    3rd-Gen
    Redline MTL is what I have in mine. It made quite a difference in shift quality and I've changed it a couple of times since (I'm right near 200k miles now).;) Still 75w80, and I would NOT go thicker; that will make the notchiness much worse when cold. It's still somewhat of a PITA when I'm in...
  8. Oil change @ 195k

    2.5L I-4
    I just UOAd on the last drain (188k) so no. I did post it here.... all was fabulous. I typically pull a sample yearly, just to check on things, if everything appears to be ok.
  9. Warped Breaks/Rotors

    3rd-Gen
    The rule for any sort of nasty grade is that when you come over the top and select the gear for the downward section if you find yourself accelerating you are in the wrong (too high) gear!
  10. Oil change @ 195k

    2.5L I-4
    It's decently dark but not in terrible condition. The UOAs I've pulled at that mileage didn't show the oil out of serviceable parameters. I have not, however, run a TBN on it so I don't know how much of the additive package was left; if I was intending to extend drain intervals I would, but I...
  11. Oil change @ 195k

    2.5L I-4
    Before oil change level... After.... And yes, I did say 195k. That's a bit less than a half-quart of consumption over 7,500 miles. Pennzoil 0w20, 5L bottle, no extra. That's where I end up with a full drain, change of filter, run it for a couple of minutes and then wait 15-20 minutes...
  12. Warped Breaks/Rotors

    3rd-Gen
    I guess it depends on what you're looking for. Centric and Stop Tech are both decent options. Stop Tech are a bit more money but then again you can get 'em in slotted, which so long as they're not a LOT more expensive I like -- but do note that slotted rotors (1) cannot usually be turned and...
  13. Warped Breaks/Rotors

    3rd-Gen
    Most of the time "warped rotors" aren't. If someone tells you they are ask them to show you a dial indicator proving there is runout in the rotor surface. Betcha there isn't UNLESS someone did a brake job and didn't clean the mating surface of the hub and rotor, and thus torqued it down while...
  14. Premium Fuel Leak Into Oil

    2.5L I-4
    Meh. In a BOAT, which has an open (vented to the atmosphere) fuel system, ok. Why? Because ethanol is hygroscopic (picks up water vapor from the air) and water doesn't burn real well, never mind corrosion issues. In a CAR, which has a CLOSED fuel system (vented only under material negative...
  15. Premium Fuel Leak Into Oil

    2.5L I-4
    Because it's mounted on the same bracket as the vacuum pump, it LOOKS like there is a path back into the valve cover from the back of it (from the shop diagram) and, as it turns out, THERE IS! So if it leaks there guess where the fuel is going? RIGHT INTO THE CRANKCASE.
  16. Premium Fuel Leak Into Oil

    2.5L I-4
    @Jake Wilcox - Aha. So there IS a path into the oil system from the HPFP. It's not clear from the workshop manual that there is, but it makes sense that there is given how it's mounted. The good news is that it's an easy replacement and I don't think the pump is that expensive even if you had...
  17. Thoughts on a 2017, CPO, Grand Touring?

    3rd-Gen
    Yeah I'd take that deal.... $22k for a car that stickered at $35k and had 6,200 miles on it when you got it, with extended warranty on the expensive bits?
  18. Premium Fuel Leak Into Oil

    2.5L I-4
    Material fuel dilution at this sort of low mileage after an oil change is an immediate-action item; attempting chemical treatment of a mechanical problem simply allows the problem to go on for longer and do more damage. The OP is headed for serious engine damage with the potential for a...
  19. 2018 underbody insulation + snow/ice = trouble

    3rd-Gen
    All that underbody stuff is mostly about wind resistance (it makes a fair bit of difference too) but it looks like the manufacturers forgot that white crap that falls on a huge part of the planet during certain months. I'd be very unimpressed with that sort of thing were it my vehicle, and...
  20. Premium Fuel Leak Into Oil

    2.5L I-4
    You likely have a leaking injector. Find and fix it immediately; it's not just oil dilution and the damage to bearings that is likely to be going on, but also cylinder washdown which will greatly accelerate the wear on that cylinder. The premium fuel was not involved, however. It's a...
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