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Switching to synthetic oil? Should I?

This is a discussion on Switching to synthetic oil? Should I? within the General Help forums, part of the LSx Technical Help Section category; I have been running the Valvoline High mileage oil for the past 10K miles, at 128K now on the clock. ...

  1. #1
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    Switching to synthetic oil? Should I?

    I have been running the Valvoline High mileage oil for the past 10K miles, at 128K now on the clock.

    Does it make sense to go to Synthetic or just keep running the high mileage Valvoline oil?

    I was thinking Mobil 1.

    I am reading through the oil sticky and trying to make heads or tails of it.

  2. #2
    Senior Member 1MileCrash's Avatar
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    1999 Z/28 M6

    GM sent the LS1 out of the factory using Mobil 1 so you should be using synthetic anyway. I started using valvoline high mileage full synthetic a year ago and have liked it. Found it at walmart at a decent price.
    1999 Z/28

    M6 w/ Hurst shifter and SLP skip shift eliminator, drilled rotors, Y3F package, SLP lid w/ K&N filter, VFN fiberglass 2" cowl hood, TSP 1 3/4" headers & ORY

  3. #3
    Member JacobLS1's Avatar
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    Longer engine life, less oil changes..makes perfect sense to me.
    1998 Z28: Bolt-ons, Stage ? 4L60E. 250rwhp@6500Ft (R.I.P 5/1/2013)

    1998 Mystic Teal Trans Am: Bone stock. (In process)

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    So there is no danger of seals leaking, leaks starting or anything like that?

  5. #5
    Spaz is My Mentor SMWS6TA's Avatar
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    Navy Blue Metallic
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    Seals leaking from synthetic oils use these days is not as bad now a days.

    If you want to go to synthetic you can.

    When taking a car off dino oil to synthetic it will take a few oil changes to flush the dino oil out.

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    The issue with seals leaking was from many years ago -- not a problem with today's synthetic formulations. I currently run Penzoil Platinum in both of our LS-family engines. As the vehicles were both pre-owned, I have no idea what was used in them before me.

  7. #7
    Electrical Engineer KMdef9's Avatar
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    I've been using mobile 1 since I got my car, with no issues (knock on wood), so I would recommend to switch.

  8. #8
    Moderator 35th-ANV-SS's Avatar
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    Also a fan of Pennzoil Platinum.
    It's on jackstands.

  9. #9
    Former Mopar Man 2002ssslp's Avatar
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    Why not try a synthetic blend, save some money and get the benefit of both worlds.

  10. #10
    Retired NOT tired SteveC's Avatar
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    Quote Originally Posted by BlackPearl View Post
    So there is no danger of seals leaking, leaks starting or anything like that?
    your seals will leak when changing over to a full synthetic @ that milage (if you have been using conventional oil from the beginning), I would stick to the high milage dino oil.

    SteveC

  11. #11
    Senior Member JayTA98's Avatar
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    been using Mobil 1 EP in my TA with Fram EG filter and Penzoil Platinum in my wife's altima. Happy with both oils so far. My car leaks some oil but im used to it now. i replaced the oil pan gasket and it leaks less.

  12. #12
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    Has anyone tried the Mobil1 High mileage synthetic? I was tempted to try that.......

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