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Thread: Engine Oil & Tranny Fluid

  1. #1
    2013CTSV is offline Cadillac Owners Member
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    Engine Oil & Tranny Fluid

    Hey guys,

    Quick question, what do you guys/gals use in terms of fluids for your cars? I was reading around and people say change your oil and tranny/diff fluid after a few hundred miles of owning the car and it makes a nice different in how its revs drive & shifts. Can anyone attest to this? Also what do you run and recommend?

    Thanks


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  3. #2
    cruiser68 is offline Cadillac Owners Enthusiast
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    Re: Engine Oil & Tranny Fluid

    No change in performance with better oils. Just more insurance.

    I run amsoil in both engine and tranny along with the rear diff. I changed the engine the first time at about 1000 miles and the trans the first time at 10K. I use OLM for oil changes. Change the diff after every track weekend. Change the trans every 15-20K.

    Enjoy your ride!

  4. #3
    2013CTSV is offline Cadillac Owners Member
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    Re: Engine Oil & Tranny Fluid

    Quote Originally Posted by cruiser68 View Post
    No change in performance with better oils. Just more insurance.

    I run amsoil in both engine and tranny along with the rear diff. I changed the engine the first time at about 1000 miles and the trans the first time at 10K. I use OLM for oil changes. Change the diff after every track weekend. Change the trans every 15-20K.

    Enjoy your ride!
    thank cruiser, what weight do you run for your engine oil? Also is tranny fluid tranny fluid and diff fluid diff fluid? What I mean by that is are there different weights to those as well that I should be concerned with?

  5. #4
    baabootoo's Avatar
    baabootoo is offline Cadillac Owners Connoisseur
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    Re: Engine Oil & Tranny Fluid

    I just follow the owners manual and live by that. From what I read, Dexron VI is almost a synthetic trans fluid due to it's properties.

  6. #5
    2013CTSV is offline Cadillac Owners Member
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    Re: Engine Oil & Tranny Fluid

    Yea that is probably what I will end up doing but people experiment and report back a lot of findings so its nice to explore options ya know.

  7. #6
    cruiser68 is offline Cadillac Owners Enthusiast
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    Re: Engine Oil & Tranny Fluid

    5w30 in the engine, 75/140 in the rear diff for track weekends 75/90 for no track work. I like the Amsoil light ATF fluid as it is full synthetic and I like the extra insurance for track days. Dexron VI is semi-synthetic.

  8. #7
    2013CTSV is offline Cadillac Owners Member
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    Re: Engine Oil & Tranny Fluid

    Quote Originally Posted by cruiser68 View Post
    5w30 in the engine, 75/140 in the rear diff for track weekends 75/90 for no track work. I like the Amsoil light ATF fluid as it is full synthetic and I like the extra insurance for track days. Dexron VI is semi-synthetic.
    Thanks! Appreciate that.

    ----------

    Quote Originally Posted by cruiser68 View Post
    5w30 in the engine, 75/140 in the rear diff for track weekends 75/90 for no track work. I like the Amsoil light ATF fluid as it is full synthetic and I like the extra insurance for track days. Dexron VI is semi-synthetic.
    Thanks! Appreciate that.

  9. #8
    JGeezer's Avatar
    JGeezer is offline Cadillac Owners Member
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    Re: Engine Oil & Tranny Fluid

    Quote Originally Posted by cruiser68 View Post
    5w30 in the engine, 75/140 in the rear diff for track weekends 75/90 for no track work. I like the Amsoil light ATF fluid as it is full synthetic and I like the extra insurance for track days. Dexron VI is semi-synthetic.
    I have to update my profile, I found a super clean 2004 that I'm just getting into!

    Which Amsoil ATF do you like? The MTF "Synchromesh" or regular ATL? My 80K mile synchros aren't bad, but I can hear some bearing noise at times when there's any pressure on the stick.

    I also have (surprise!) some light diff whining. Not going to be a track car, but would you try the 75/110 or always stick with the 75/90 for street use?

    Thanks!


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