Would you switch to Mobil 1 synthetic at 42,000 miles?

Discussion in 'Chevy Silverado Forum (GMC Sierra)' started by Steve V., Jul 1, 2013.

  1. Steve V.

    Steve V. New Member

    I've been using the dealer for my oil changes thus far and want to go back to doing my own. Would you switch over to Mobile 1 at 42,000 miles or keep using the GM oil?


  2. RayVoy

    RayVoy Epic Member 5+ Years 5000 Posts


    Any stories you may have heard are nothing but "old wives tales".
  3. j cat

    j cat Epic Member 5+ Years 1000 Posts

    some engines require dexos GM spec for proper engine protection. find out what you engine requires.

    I would not worry about switching to a synthetic engine oil at this time. you may have had synthetic put in it at the dealership if you have a 2007 engine and newer.

    The mobil 1 I use is now Dexos approved . I have found this to be very good with reduction of some of the engine noise on cold starts in very cold weather for the first 2 min.

    I hope your not using regular dino oil as this oil is not good for these type truck engines even if it is an older one. make sure you use the proper viscosity. this should be 5-30wt. also get / use quality oil filters no fram filters. ac delco/mobil/napa gold/wix/purolator pure one .............
  4. stchman

    stchman Active Member 2 Years 1000 Posts

    I've been using Mobil 1 for years now on my vehicles with no problems or complaints.

    - - - Updated - - -

    I use Mobil 1 and AC Delco oil filters on my vehicles. I've had success with filters like Purolator and Wix, but the AC Delco filters are the same price.
  5. 99Yuk

    99Yuk New Member

    What do you guys recommend on a 99 Yukon with 156K? I switched to synthetic a year ago and noticed a need to add a quart after about 1500 miles. That doesn't seem right.
  6. ChevyBoy2009

    ChevyBoy2009 Rockstar 4 Years 500 Posts

    On my last truck which was an 03 silverado 1500,i got the truck at 100k and switched to Mobil 1...never had any issues. When i got my 09 silverado last year,the first oil changed i did was to Mobil 1 and im never lookng back.Go ahead and switch!
  7. Pikey

    Pikey Moderator Staff Member 5+ Years ROTM Winner 5000 Posts

    I used Mobile one from the first oil change on my 2002 when I bought it new. When I bought my 2003 with 130,000 on it I switched to mobile 1. I did notice it was losing oil somewhere. I did not see any leaks so it had to be burning it. I switched to mobile one high mileage and the oil level stopped dropping. When I totaled that truck and bought my 2005 with 130,000 on it I switched to Mobile 1 high mileage. It runs smoother than when I bought it, the oil level is at the same place when I drain it as it was when I filled it, and I have had no leaks develope. The only thing bad about the Mobile 1 high mileage is that it is not recommended for frequent towing or extended idling times.
  8. j cat

    j cat Epic Member 5+ Years 1000 Posts

    give details on oil used, viscosity etc. oil filters used. another thing replace the PCV and check hoses for leaks.

    what oil was used in it before , give oil details . also the frequency of oil changes with the non synthetic.
  9. ChevyBoy2009

    ChevyBoy2009 Rockstar 4 Years 500 Posts

    3,500 miles on conventional and 4-5k on synthetic...thats what i do
  10. phoebeisis

    phoebeisis Epic Member 5+ Years 1000 Posts

    I used Mobil 1 ever since I bought my 1998 Suburban-in 2007- with 195,000 miles on it
    223,000 now-runs fine
    I did switch to 10w30 extended service-since I'm lazy
    and my idle oil pressure was 20 psi-which is plenty- but went to 10w30 instead of 5w30
    live in hot climate-NOLA-and plenty of miles-hence the 10w30
    sticking with 5w30 probably would have been just fine-
    if I live farther N I certainly wouldn't use 10w30- 5w30
    we are hot most of the time-and rarely get to 30 degrees-1 two days a year maybe

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