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Chilton / Haynes Manual Difference

Tiny
CFERRY1
  • MEMBER
  • 1990 CADILLAC DEVILLE
  • 180,000 MILES
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?
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Friday, January 20th, 2012 AT 10:43 PM

2 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
If I were you just replace it every 12K or 1yr which ever occurs 1st
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Friday, January 20th, 2012 AT 11:00 PM
Tiny
CADIEMAN
  • 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.
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Friday, January 20th, 2012 AT 11:23 PM

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