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  1. M

    Synthetic vs conventional

    IFF your engine burns oil, then yes, you want your engine to burn the cleanest possible oil. If not, then this is not an issue.
  2. M

    Synthetic vs conventional

    Unless your Tahoe works or plays unusually hard, so long as you change your oil every 5000 miles or less, it likely does not matter anymore what 'synthetic' motor oil your vehicle is using. If the motor oil is good enough for a DuraMax (or even a DuraMedium 6-inline, or DuraMini 4-inline), it's...
  3. M

    $64 for 8-Quart Full Synthetic Oil Change at local GMC dealer

    I used to work at a mechanic shop where the owner also owned a 'vette. He used 'the best synthetic oil I could possibly find' in it, and changed it every 3000 miles. He would then run this used oil through a filter (not an engine oil filter), and store it. There was always a small group of...
  4. M

    Z71 Front End Swap

    For the luvuvasonuvabitch, please stop with the BS. So there's no issue with the alignment of the front hooks?
  5. M

    Z71 Front End Swap

    I'm actually curious about the reverse: I want pill shaped foglights and the front under-the-metal-bumper stuff that goes with it.
  6. M

    Slight miss at idle, poor MPG, sooty exhaust pipe, No codes. 250K

    Why'd you turn off the VVT?
  7. M

    Oil pressure drop 2007 Tahoe 5.3

    If you use the engine during the winter, thicker oil is a liability. Before addressing the oil pump, do a used oil analysis. If it turns up too many wear metals, even a 'V4 mode' oil pump will only delay the inevitable at best; better to start shopping for a 6.0L. If the wear metals are low...
  8. M

    New to catch can

    Your catch can may have been located in a cool spot where humidity would tend to condense.
  9. M

    Fuel efficiency drop in newer models ?

    I'm almost sure that more axle gear would neither improve the 12.4MpG-towing, nor the 16.5MpG-unladen ... the only thing GM can possibly do to the 10speed is improve the ratios relative to each other; 10 speeds seems like more than enough. Unladen, with 3.42, it depend on how fast you prefer to...
  10. M

    Does my radiator have an engine oil cooler?

    I suppose this is true. That said: I typically see air-to-oil / air-to-ATF as coolers because they are being cooled from the outside air. I typically see coolant-to oil / coolant-to-ATF as exchangers because they exchange 'heats' with each other. Typically, in the radiator's ATF heat exchanger...
  11. M

    OEM parts on Amazon?

    So, GE poached a product development specialist from John Deere? Or Hewlett Packard?
  12. M

    2014 PPV 12533 Hours on 122K mileage WOW

    122,000 miles, divided by 12535 hours, 9.733MpH 12535 hours, divided by 10 years, 1253 hours a year, 104 hours a month, 24 hours a week, or 3.433 hours a day. About 3.5 hours a day @ an average of 9.733MpH. Sounds like this PPV chased - and arrested - mostly donuts (not the smoked rubber...
  13. M

    OEM parts on Amazon?

    (Assuming that the microchip was not for location monitoring or purchase tracking,) what is the purpose of putting a microchip on this filter? Just 'cause the box is OEM, doesn't mean the contents are. We are living in the age of caveat emptor.
  14. M

    Does my radiator have an engine oil cooler?

    Y'all keep calling the radiator's motor oil tank an oil 'cooler' - it's a heat exchanger. It's actually meant to help motor oil reach minimum operating temp sooner. However, once the motor oil reaches or exceeds minimum operating temp, the coolant is actually warmed by the motor oil - motor oil...
  15. M

    Coolant Temp Issues

    Before reading further, this would point to a faulty coolant level sensor, no? I actually suspect your H2Opump may be failing. If it's not pumping well at lower RpM, maybe this is causing momentary hot spots / air pockets until the coolant flow increases by enough to flush liquid coolant...
  16. M

    IS AFM DISABLEMENT NECESSARY??

    I'm beyond convinced GM came up with V4 mode because their V8s were TOO long-lived - they want everyone needing another vehicle after 150,000-175,000 miles. Engines that last 250,000 miles on average are bad for GM 's bottom line. How'd your transmission do? The real benefit of 91 / 93 octane...
  17. M

    OEM parts on Amazon?

    This is why I don't buy from Amazon. ebay's not much better, but over 99% feedback for over 5 years is usually enough to make me feel better about the purchase.
  18. M

    4:10 diff

    One of the oldest calculators still around: https://www.angelfire.com/fl/procrastination/rear.html 2500RpM = 82MpH 2300RpM = 75MpH I wanna do this too, even though I'll need to get rid of my 3.73 front diff as well. If I drove enough highway, I might look for 3.90 instead.
  19. M

    IS AFM DISABLEMENT NECESSARY??

    So, in AFM's OPINION, was it that the oil hadn't been changed in almost a year, or that it had only been driven 300 miles in the last year, that was grounds for one of your lifters failing you? ... Or was it GM? ...
  20. M

    2004 Tahoe Brakes, Master Cylinder

    I'm not sure enough to definitively answer your 1st question, so I won't, to cover my spindly lil @$$. As easy / hard as it is on any of those other vehicles. You said something about not being able to 'really afford that'? Well, then you might have trouble affording a 2010 Suburban front...
  21. M

    Rattling at low speeds/coming to stop

    Have you changed the ATF yet? If you were to dare to caost to a stop without using the brakes, do you suffer the same symptom?
  22. M

    What is a Z71 Tahoe

    There was a year when GM decided that RPO Z71 could make them more money, if they let 2WD models also use it. In other news, how many RWD Jeep Wranglers have you seen that lack any traction enhancement in the rear diff? In NYC, I've seen far too may so-called 'Jeep' 'Wranglers' get ONE tire...
  23. M

    IS AFM DISABLEMENT NECESSARY??

    With 100% accuracy for each specific iteration? No, of course not. But this is like saying, maybe I don't need to wear my seat belt, it might not save my life at anytime during this specific drive. Frankly, the seat belt has NEVER protected me ... so far ... Disabling Engine Half@$$ does not...
  24. M

    poltergeist in the electrical system

    1. Likely no. 2. Almost sure this is a random symptom of your actual electrical gremlin problem. You may have intermittently good/bad connections. If you wiggle a wire loom and replicate the problem that way, that wire loom has at least one wire that is contributing to the problem. I'm sure...
  25. M

    Major upgrades GMT800, 06ish XL 2500

    For that he got a 6.6L DuraMax that can outlast the truck AND pay for itself in fuel and maintenance savings. So, about 1/4th the price of a new bubba with a 5.3L petrol V8? I get that considerable time and energy have been spent to save all that money, but $15k to swap an LBZ into my '02...

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