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OIL - Conventional vs. Synth Blend vs. Full Synth

This is a discussion on OIL - Conventional vs. Synth Blend vs. Full Synth within the General Help forums, part of the LSx Technical Help Section category; What do you all reccomend as far as conventional oil or synthetic oil, or synthetic blend? My '99 T/A (LS1 ...

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    Member transAMchubby's Avatar
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    OIL - Conventional vs. Synth Blend vs. Full Synth

    What do you all reccomend as far as conventional oil or synthetic oil, or synthetic blend?

    My '99 T/A (LS1 M6) has 90K miles on it, does not burn oil, but does have a small leak. I'm planning on 10W-30 (as per Sarge's reccomendations). The previous owner doesnt even know if he used conventional or syn.

    Would it make a difference if it has syn in it now and i switched to conventional? I've heard thats not so good...but i dont know.

  2. #2
    Senior Member Danger731's Avatar
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    No difference as long as you change the oil and use a good filter. Synthetic blend is only partially synthetic. You would be better to use your own mix, say 3 qts synthetic like penzoil platinum and the rest a good dyno oil. I'm at 105 k and I use my own mix. I started with regular dyno oil.

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    Grand Imperial Wizard Sarge's Avatar
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    Whichever you utilize...synthetic or conventional....AutoRX that motor first.
    Many a leak has been cured due AutoRX...it really cleans and conditions the seals and all internals best I have seen......when the seals have been cleaned and conditioned they ...well....they seal.....what a concept huh? Follow the instructions to a T....
    http://www.auto-rx.com/

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    Member transAMchubby's Avatar
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    is it true that you are not supposed to switch to conventional oil if you are already using syn?

    and if i do not know what the previous owner used, is there a way to find out if it is conventional or syn?

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    old timer blue02Z's Avatar
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    can-O-worms you opened buddy

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    Senior Member clg82's Avatar
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    Quote Originally Posted by Sarge View Post
    Whichever you utilize...synthetic or conventional....AutoRX that motor first.
    Many a leak has been cured due AutoRX...it really cleans and conditions the seals and all internals best I have seen......when the seals have been cleaned and conditioned they ...well....they seal.....what a concept huh? Follow the instructions to a T....
    http://www.auto-rx.com/
    i heard that stuff ruins your seals, is that true or not?
    2000 Arctic White trans am, ws6 hood, ws6 air box, slp lid, slp smooth bellows, slp loudmouth exhaust,shift kit, rebuilt trans, LS6 intake, 3.73 gears, Shaner S3 p/p throttle body, and a tune . SFC. C6 ZO6 rims 18" in back 17" in front. Drilled and slotted rotors.

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    Member transAMchubby's Avatar
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    Quote Originally Posted by blue02Z View Post
    can-O-worms you opened buddy



    any help is greatly appreciated! im trying to get her in as good of shape as possible before i drive back to school for homecoming. i hear the ladies this year are real nice!

    so is this AutoRX availible in autozone or o'reiley's? or do i have to wait for it to get here in the mail?

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    old timer blue02Z's Avatar
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    Quote Originally Posted by clg82 View Post
    i heard that stuff ruins your seals, is that true or not?
    negative, it is a non abrasive cleaner. it conditions your seals. that is why it takes 1500 miles to work

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    Junior Member dreed2's Avatar
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    I've used nothing but Pennzoil's synthetic since I bought the Z28 new. I used the cheaper oil for the first oil change because I knew I had to change it again at 500 miles, but nothing other than Pennzoil synthetic ever since. The owner's manual calls for Mobil synthetic, if I recall. But the Pennzoil place is right across the street from where I work and I change it every 3,000 miles, so it works for me.

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    old timer blue02Z's Avatar
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    pennzoil platinum is darn good stuff. kicks mobil 1 square in the nuts

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    Junior Member dreed2's Avatar
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    I still use Mobil 93 octane gas, though!

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