Chilton / Haynes Manual Difference

1990 CADILLAC DEVILLE
180,000 MILES
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CFERRY1
  • MEMBER
  • 29 POSTS
Hello -

1990 CAD Deville 4.5 L FWD

Could someone please explain why the Chilton Repair Manual and the Haynes Repair manual specify different Maintenance Service Interval's.
Ex. (Haynes - spark plugs replace 30K mi. / Chilton - spark plugs replace 100K mi.)

What is the correct Maintenance Interval for this vehicle ?
Jan 20, 2012 at 2:43 PM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
If I were you just replace it every 12K or 1yr which ever occurs 1st
Jan 20, 2012 at 3:00 PM
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CADIEMAN
  • ✓Experienced Mechanic
  • 3,544 POSTS
platumium plugs is 100k copper plugs 30k .when u change the plugs is when u cant clean and regap them because the center ingiter has worn to the porclen then the platumium plug will need to be replaced.copper ones u change every tune up and are much cheaper.
Jan 20, 2012 at 3:23 PM
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