Changing To Synthetic

Discussion in 'Oil' started by 90FXRS, May 6, 2018.

  1. 90FXRS

    90FXRS Junior Member Contributor

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    I'm working on an 87 XLH 1100. As far as I know it's always had Harley Regular Heavy, 50wt, in it. Would changing it to 20-50 synthetic have any adverse affects? Leaks are my main concern. The topend has just been rebuilt.
     
  2. gator508

    gator508 Well-Known Member

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    As long as all sealing surfaces are tight I would not think going to syn would have adverse effects...drain the regular oil well...JMHO
     
  3. Jeff Klarich

    Jeff Klarich Experienced Member Contributor

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    What I've noticed on mine and others have reported, you may hear a little more top end noise using synthetic but nothing to worry about.
     
  4. Harttoo

    Harttoo Well-Known Member

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    I found more top end noise with SYN3. Normal or slightly less top end noise with Mobil1 v-twin.
     
  5. Blue Wide Glide

    Blue Wide Glide Junior Member

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    Synthetic oil will find any mating surfaces that are not completely sealed, and weep out:(. It will also keep your engine cleaner:)! I also use Mobil1 V-Twin.
     
  6. jamesearl

    jamesearl Well-Known Member

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    Start changing every 5 k!
     
  7. NCBILL

    NCBILL Active Member

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    My preference has always been Amsoil 20-50 full synthetic in the engine, and Redline V-Twin full syn for the primary. Never a problem between 5,000 mile changes on the engine oil and 10,000 on the primary. Both have been very clean on inspection after all changes.