Which oil?

Discussion in 'Chevy Silverado Forum (GMC Sierra)' started by Barnettamb, Feb 14, 2013.

  1. Barnettamb

    Barnettamb New Member

    Hey guys i have an 07 silverado with a little over 70 000 miles. ive been putting 5w 30 oil in it but this time i bought 10w 30. is 10w 30 better or does it matter.

    also my friend has a tahoe with 200 000 miles and wants to start changing his own oil. is there really something better about the high mileage oil or should he just use normal 10 30 oil.

    any input would be appreciated. thanks
  2. buckmeister2

    buckmeister2 New Member

    Barnett, you are going to get soooo many variation on this, but I will give you mine. The 5w-30 is better in the winter, and in the summer if your truck is not burning any oil. The lighter weight oil gets to the rotating masses in the engine quicker on start-up, especially in winter, which means less wear. If the vehicle sits several days, virtually all the oil is drained into the pan, which results in a dry start-up. The quicker you get the oil up into the motor, the less wear, in theory. As for the high-mileage oils, there is zero benefit from them. It is a marketing idea to sell more oil. Oil makers still tout changing every 3K, or 90 days, even though that old wives tale was put to rest years ago. Use a good oil, in the weight the owners manual recommends, and change at the intervals they recommend.
  3. ChromeSilver02

    ChromeSilver02 New Member

  4. steved

    steved Former Member

    +1. Find the correct weight and pick your favorite brand in that weight...
  5. buckmeister2

    buckmeister2 New Member

    Everytime someone asks about oil, all kinds of answers come up. Citing a sales presentation by Mobiloil as evidence that the product might be worth something, well, I guess we might as well all be using STP, wearing Aqua Velva after shave, and taking Carter's Little Liver Pills. No independent lab has found a single component in "high mileage" oil that is both beneficial, and absent in other quality oils. I even find it offensive that Mobiloil would consider 75,000 miles to be "high mileage"...what are they all driving, Yugo's???? Of course, that is just my opinion....
  6. Barnettamb

    Barnettamb New Member

    thanks for the tips. my truck is actually burning a little oil thats why i decided on the 10 30 this time just to try it out.
  7. TRPLXL2

    TRPLXL2 New Member

    I have an 05 2500HD with the 6.0, and I switched to 10w30 a long time ago. Main reason is the piston slap sound was driving me nuts, 10-30 quieted it right down.
  8. ChromeSilver02

    ChromeSilver02 New Member

    I guess you think that every ad that is out there has no truth to it at all? Yes I don't think that 75,000 is considered high mileage for newer vehicles but I wasn't promoting an oil product, I was showing quick example of what it has to offer.

    If you really want to have independent opinions and thoughts on high mileage oil "Bob Is The Oil Guy" forum has tons of information for one to look through. That is where I got the link.



    Last edited: Feb 15, 2013
  9. steved

    steved Former Member

    A 10w30 is the same viscosity as a 5w30 at operating temperature...a 30 weight is a 30 weight.

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    That's because labs are looking at common compounds. There is nothing saying oil blends can't have additional things like proprietary seal conditioners, antiwear additives, etc.. The typical lab is not set up to analyze for everything under the sun.

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    Unfortunately oil type typically won't stop oil burning. The only thing that will slow oil burning sometimes is a thicker viscosity...I would actually consider a stout 5w40 or 15w40 diesel oil like Rotella if you felt like experimenting. But that's just a thought, and not a sure thing.
  10. j cat

    j cat Active Member

    with your vehicle 5-30wt is the OEM correct engine oil. I use synthetic mobil oil in my 2000 SILVERADO 5.3L since 2001. the engine now at 140,ooomi has no oil issues/leaks/etc. this engine is well known for the piston slap/knock when on start up in cold temps.

    I do not recommend any non synthetic oils in these GM engines. trucks require a high quality synthetic oil to handle the heat created by loading.

    high mileage oil for me is the 15,ooomi mobil synthetic oil that is offered. I use the less expensive mobil synthetic . replacing the oil at 8,ooomi.

    the oil filter is the part that effects the wear on the engine. I use most times WIX/PUROLATOR PLUS/as well as the ac delco . I do not use or recommend any fram made filters. these filters are made poorly. QC is not good.

    your 2007 may require the dexos GM approved engine oils. my last purchase of the mobil 1 5-30wt oil has now the GM dexos approval label. the oil seems to work quite well in the cold temps. engine is very quite on first starting . this GM dexos seems to work well so far. my 2000 engine does not require it , but I can see the difference .

    using synthetic fluids in the engine and transmission does improve mileage. your 2007 should have synthetic OEM fluid in it. dexronVI it what the spec is now.

    with synthetic engine oil cold weather creates faster starts and less stress on the starting components.
  11. PantheraUncia

    PantheraUncia New Member

    my manual states 5w30 on my 2000 5.3L...... last year I moved to 10w30 to see if it was thick enough to slow some of the oil leaks I am having and it helped a little.

    Synthetic is expensive and it would leak quicker so i would cost me allot more in the long haul.
  12. j cat

    j cat Active Member

    I pay 30.oo for a 6 qt case of mobil synthetic . change oil at 8,ooomi. this is 2x that of the dino oil. so that comes to 5.oo a qt for synthetic. dino goes for 3.50 qt correct ? so I do not see how you are saving anything on the dino/non synthetics. also synthetics you do save on fuel .
    since I do the oil changes I like going 2X on the oil changes less mess/work.
  13. Conlan Rose

    Conlan Rose Super Moderator

    Currently I'm running reg oil because of a leaking fitting but once it is fixed I will be running Mobil 1 syn. When I run reg oil I only use Pennzoil because they have very high quality reg oil. I only use spec oil 5w-30 using non spec oil can harm the engine in the long run.
  14. paracutin

    paracutin New Member

    +1 for bobistheoilguy.com
    Excellent information there.

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    Fixing the leaks would be better still. ;)

  15. bazar01

    bazar01 New Member

    Been using Mobil 1 10W30 on my 170k miles Suburban with 5.3L. Never leaked a drop but it burns 1 qt. every 5k miles. Changed it every 5k miles at most 7.5k miles interval using only AC Delco filter (PF61). It still has the slight piston slap on cold start up but it has not gotten worst. Still pulls very hard.

    On the 2011 silverado with 5.3L, recommended is 5W30 dexos so I use Mobil 1 full sythetic extended but change at 8k miles still with 40% oil life. I am not comfortable with 15k mile oil change interval.

    5w30 and 10W30 are basically the same viscosity at operating temp. So it should not make a lot of difference at operating temp other than a little thicker viscosity on cold start up on the 10W30..
  16. buckmeister2

    buckmeister2 New Member

    No, I don't think no ads have truth, and certainly did not intend to rile you up. My apologies for that. My point was that using a marketing campaign from a vendor as a source for why people might consider that vendor is a bit like asking a Ford dealer what vehicle they prefer, and why. As a matter of fact, I use Mobil synthetic in my 168K truck, but I would not even consider using their "high mileage" oil, simply because there is zero benefit to it, yet Mobil markets it as having some kind of voodoo ingredient that will help your engine last longer.

    As for independent information, there is no shortage of test info on oils of all kinds and applications. I study them from time to time. I have visited "Bob's" site before, and found it informative.
  17. ChromeSilver02

    ChromeSilver02 New Member

    No hard feelings man, I wasn't riled up, atleast wasn't trying to come across that way. I think that ads has some truth in the product they are selling but I think that they really over play the importance of their products to the consumer. I understand what you are saying, I guess I should have used different example instead of a product page.
  18. j cat

    j cat Active Member

    many years ago I did use pennzoil and castrol regular engine oils in a 1983 car. replacing the oil ever 3500mi. I got 17years / 380,ooomi and never had any engine problems. no leaks , oil adding as well.

    with the 2000 truck and this type engine the synthetic made a big difference . the 2000 came with dino oil when new. so when I changed to synthetic I will never go back. the old engines you had no problem using dino oil. these new engines with the use of alcohol fuels dino and water from the fuel is a bad combination.
  19. stchman

    stchman New Member

    The manufacturer calls for 5W-30, put 5W-30 in it.

    I use Mobil 1 5W-30 with an ACDelco PF48 oil filter. No problems with my 2008 and I don't think I'll have problems with my 2013.
  20. Barnettamb

    Barnettamb New Member

    thanks for the replies they were helpful

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