dino to synth conversion
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This is a discussion on dino to synth conversion within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; to my understanding, is it correct that its not required to flush out your engine when converting to synthetic oil? ...

  1. #1

    dino to synth conversion

    to my understanding, is it correct that its not required to flush out your engine when converting to synthetic oil? and if so, its correct that you can go about the conversion like any other oil change?

    sorry for the nubie ques. never done the synthetic oil conversion myself before.

    i dont have to change the filter or anything, right?

    i searched nd i got contradicting answers. so i want to double check with this post.

    im hearing that its being on the safe side to flush the entire engine out. but since i only have about 8k miles on my engine, i doubt that their would be any build-up that would critically harm my engine.

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  3. #2
    Registered User qoncept's Avatar
    Join Date
    Oct 2003
    Montgomery, AL
    Just do it like any other oil change.. no big deal. How many miles do you have? A myth is that switching to synthetic will cause oil leaks. The truth is that it'll just leak easier than conventional oil. Unless you have a whole ton of miles you should be fine. I'd also go ahead and change the filter just like any other oil change.

  4. #3
    Registered User Judas's Avatar
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    Nov 2003
    North Pole, Alaska
    The only time I can remember that a synthetic actually caused a leak was when they were all 100% PAO based. Soon after, they realized that PAO's shrink seals and cause leaks, and began formulating blends including esters in the correct proportion to offset the shrinkage...I think I saw somewhere that a typical top-of-the-line synthetic is around 80% PAO and 20% ester base stock.

    It's true, though, that with low miles you don't have to worry about flushing your engine or anything like that. Even if you've been using the crappiest group III dino oil for a few thousand miles, the superior detergent package of a good synthetic will do a good job of scrubbing that gunk out.

    EDIT> ...and definitely don't forget the filter. If you're going to do it yourself, Wix and Purolator make good filters, but if you really want to be neurotic you could spring for an Amsoil, Bosch, or Hastings...
    Last edited by Judas; 07-22-2004 at 01:15 AM.

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