Author Topic: Oil Question?  (Read 584 times)

Offline Gearheadmike

  • Posts: 20
  • Name: M Ero
Oil Question?
« on: September 23, 2018, 10:04:35 PM »
So the 66 i just picked up with the 429 is missing the original oil dip stick and i wan't to drain the oil and add the correct amount so i have a good state of mind that the correct level is in it.
   My buddy keeps saying i should run some shell rotella 15w-40 diesel oil in it  as that's what he run's in his old chevy caprice with the original big block plus he's got a 55 gal drum of it.    I'm just not sure if it will harm anything in the Cadillac's engine.
 Plus does anyone know the oil capacity of the 66 -429's?  Thanks

Offline Bobby B

  • Posts: 2732
  • Mendham, New Jersey
  • Name: Bob Bender
Re: Oil Question?
« Reply #1 on: September 24, 2018, 12:40:28 AM »
There's a reason why it's called Diesel Oil. Do yourself a favor and run a normal oil with a correct amount of Zinc in it. Too much, no good, too little, no good....Valvoline VR1, Brad Penn, Joe Gibbs, etc., etc. Subject's been beat to death here already. Anyone with a Flat Tappet Cam Engine knows the Drill.....
1947 Cadillac Series 62 Convertible Coupe
1968 Mustang Convertible
1973 Mustang Convertible
1969 Jaguar E-Type Roadster
1971 Datsun 240Z
1979 H-D FLH

Offline Jim Miller

  • Posts: 285
  • Name: Jmiller
Re: Oil Question?
« Reply #2 on: September 24, 2018, 07:32:31 AM »
Mike, I have a 1967 225 Chryler V8 in my boat. I've used Rotella, fresh change every season for ages. No problems. It does contain the zinc. In my '41 Cadillac I purchase oil from Classic Car Motor Oil. It's made for old cars - a small refinery in Indiana.
Jim Miller

1941 6219
1949 6237X
2021 XT6
1991 SDV
1999 DeElegence
2006 DTS
2013 XTS
2016 SRX

Offline kevinanderson

  • Posts: 126
  • Name: Kevin Anderson
Re: Oil Question?
« Reply #3 on: September 24, 2018, 10:13:21 AM »
I've used rotella for ages also. No problems.


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