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HT4100 4.1, 4.5, 4.9 Discussion, Best oil Mobil 1 High mileage for 93 deville 4.9 with 102,000 miles in Cadillac Engine Technical Discussion; Really? I stop by there regularly. Must have missed it. I'll go have a look. They generally have pretty accurate ...
  1. #16
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: Best oil Mobil 1 High mileage for 93 deville 4.9 with 102,000 miles

    Really? I stop by there regularly. Must have missed it. I'll go have a look. They generally have pretty accurate info over there.

  2. #17
    mike93 is offline Cadillac Owners Fanatic
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    Re: Best oil Mobil 1 High mileage for 93 deville 4.9 with 102,000 miles

    ok check it out and let me know what you think but should i use the rotella ranger.

  3. #18
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    Re: Best oil Mobil 1 High mileage for 93 deville 4.9 with 102,000 miles

    I was there and didn't see anything about it. Go ahead and use Rotella 15W40. Perfectly safe.

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    mike93 is offline Cadillac Owners Fanatic
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    Re: Best oil Mobil 1 High mileage for 93 deville 4.9 with 102,000 miles

    Ok ranger thanks

  5. #20
    chrisalcorn is offline Cadillac Owners Member
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    Re: Best oil Mobil 1 High mileage for 93 deville 4.9 with 102,000 miles

    The TPS absolutely needs to be adjusted. This is a two man job. The parameters are displayed by accessing the right buttons and getting the value to display on the Fuel Data center. The two screws that hold the TPS to the throttle need to be loosened so it can rotated while watching the Fuel Data display. This need to be ZERO or very close to ZERO.

  6. #21
    mike93 is offline Cadillac Owners Fanatic
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    Re: Best oil Mobil 1 High mileage for 93 deville 4.9 with 102,000 miles

    ok thanks chrisalcorn

  7. #22
    cadillac_al is offline Cadillac Owners Connoisseur
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    Re: Best oil Mobil 1 High mileage for 93 deville 4.9 with 102,000 miles

    I run Rotella 15-40 in mine most of the time. I left it in all winter last year and I noticed the engine turned over noticeably slower when it was below 0 degrees. I plan to use something a little thinner for this winter, maybe Rotella 5w-40. If my temps never got below10 degrees I would probably stick with the 15-40. I ran Mobil 10-30 for years in my plow truck. Last year I ran some conventional oil and that turned over noticeably slower when the temps were below 0 degrees. Sometimes that slow turning is the difference between starting and not starting at -20 degrees.

  8. #23
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    Re: Best oil Mobil 1 High mileage for 93 deville 4.9 with 102,000 miles

    I was going to add a similar comment to cadillac al's.

    back when I was new to the 4.X, I used 15w-40 on recommendations from this site. Bad idea. In the cold WI winters, I got slow turning over and even a few seconds of cold start knocking, depending on the temp. You don't have to be a powertrain engineer to realize that something isn't right at that point. I took it out and have been running the 10W-30 the engine was spec'd for with no problems.

    There really is no reason to put anything in the car besides what is spec'd for. I've been running 10W-30 Castrol GTX is all of my 4.X since I've owned them. The two I have now are at 170k miles and I've noticed no repercussions...

    Just like the antifreeze thread, do whatever floats your boat. Just make sure you follow a good maintenance schedule.

  9. #24
    mike93 is offline Cadillac Owners Fanatic
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    Re: Best oil Mobil 1 High mileage for 93 deville 4.9 with 102,000 miles

    Ok thanks guys

  10. #25
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    Re: Best oil Mobil 1 High mileage for 93 deville 4.9 with 102,000 miles

    Quote Originally Posted by Aron9000 View Post
    Since when is 103k high mileage?????
    that's what im wondering i thought the 4.X engines didn't hit high mileage tile like 150,000 or 200,000

  11. #26
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    Re: Best oil Mobil 1 High mileage for 93 deville 4.9 with 102,000 miles

    These engines are roller...as were most gm engines by this time.

  12. #27
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    Re: Best oil Mobil 1 High mileage for 93 deville 4.9 with 102,000 miles

    Yeah, that ^^^^

    I replied to the thread title, not the thread hijack. My bad ........ I could always move the hijack up to Sigma "STS". We'll see.......

    EDIT at 1005: The 2007 "STS" post moved to proper forum........ maybe he'll get some feedback there.

  13. #28
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    Re: Best oil Mobil 1 High mileage for 93 deville 4.9 with 102,000 miles

    Roger that.

    That said, I was also responding to the title. For future reference, the old 4.5 and 4.9 motors were roller since '88.

  14. #29
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    Re: Best oil Mobil 1 High mileage for 93 deville 4.9 with 102,000 miles

    Rotella 15W40 is the best for any 4.* engine.

  15. #30
    brougham is offline Cadillac Owners Master
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    Re: Best oil Mobil 1 High mileage for 93 deville 4.9 with 102,000 miles

    I've never heard that before. I guess I just don't have any reason to read oil threads here. I've always used 10W30 in my 4.9 cars.

    ----------

    I'm guessing something funny happed to this post since it suddenly came back to life 4 years after the fact?

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