Page 1 of 13 1 2 3 11 ... LastLast
Results 1 to 10 of 124

Thread: What's the best oil?

  1. #1
    Senior Member
    Join Date:  Jan 2015

    Posts:    267

    What's the best oil?

    standard, synthentic?
    81' gas flap. Sept build. 14k miles. Mostly original. Updating things...

  2. #2
    Customized Member 81dmc's Avatar
    Join Date:  Feb 2013

    Location:  Magnolia, TX / Naples, FL

    Posts:    652

    My VIN:    831

    Quote Originally Posted by Redsquall View Post
    standard, synthentic?
    Standard. I use Castrol GTX 20W50.
    Rodolfo
    Toy: VIN 831- VR6 Swap in Progress...
    Delorean.eu Roof Box, Double Din, Custom Instrument Cluster w/Cruise, QA1 Suspension.
    Cruiser: 1982 Mercedes 300SD
    Tow Pig: 2004 Dodge Ram 3500 Cummins

  3. #3
    Delorean Guru
    Join Date:  May 2011

    Location:  Northern NJ

    Posts:    7,037

    My VIN:    10757

    Club(s):   (DMA)

    Quote Originally Posted by 81dmc View Post
    Standard. I use Castrol GTX 20W50.

    The engine was made to use standard oil, syn is overkill and unnecessary. There are anecdotal cases of old motors used to ordinary oil that when switched to syn, started leaking because the seals get hardened and allow the syn to leak faster. The most important factor is regular oil changes with a good brand of oil.
    David Teitelbaum

  4. #4
    Customized Member 81dmc's Avatar
    Join Date:  Feb 2013

    Location:  Magnolia, TX / Naples, FL

    Posts:    652

    My VIN:    831

    Quote Originally Posted by David T View Post
    The engine was made to use standard oil, syn is overkill and unnecessary. There are anecdotal cases of old motors used to ordinary oil that when switched to syn, started leaking because the seals get hardened and allow the syn to leak faster. The most important factor is regular oil changes with a good brand of oil.
    The only reason to use synthetic is on a newly-rebuilt motor IMHO.
    Rodolfo
    Toy: VIN 831- VR6 Swap in Progress...
    Delorean.eu Roof Box, Double Din, Custom Instrument Cluster w/Cruise, QA1 Suspension.
    Cruiser: 1982 Mercedes 300SD
    Tow Pig: 2004 Dodge Ram 3500 Cummins

  5. #5
    Senior Member hmcelraft's Avatar
    Join Date:  Jun 2011

    Location:  Chatham, NJ

    Posts:    234

    Club(s):   (DMA)

    Synthetic is probably best

    I wrote the attached note in 2013 for a previous post. I still use Mobil 1 10W-40 High Mileage Oil and the OEM long block has about 15,000 miles on it now.
    Attached Files

  6. #6
    DMC Midwest - 815.459.6439 DMCMW Dave's Avatar
    Join Date:  May 2011

    Location:  Crystal Lake IL

    Posts:    5,132

    My VIN:    05429

    Our normal go-to oil is Castrol 20W-50. If you are the typical low mile driver and change it every year/3000 miles it should be fine. This is the official company recommendation.

    Having torn down a few engines at this point, I'm most impressed with high mile engines that have been running synthetic oil. If you are doing that I typically use Mobil 1 15W50. NOTE this is my opinion based on observation and personal use. Mobil does not recommend synthetic in this engine probably because they have not tested it. Do this at your own risk.

    I also recommend against changing to synthetic oil on an engine with unknown history and/or without a look under the valve covers. I have seen an instance where a somewhat grungy engine was switched to Synthetic, and the grunge inside started to come loose and plug things up. If there are deposits on the inside of the engine stick with the regular oil, and change it more often.
    Dave S
    DMC Midwest - retired but helping
    dswingle@DeLorean.com

  7. #7
    Senior Member
    Join Date:  Nov 2011

    Location:  Rochester, NY

    Posts:    277

    My VIN:    1776

    I use Brad Penn 20W50. It is basically the old green Kendall GT1, made in the former Kendall refinery. It has a high zinc content by modern standards, which may be beneficial for our cams and rocker arms. Castrol GTX 20W50 is also well-regarded.

  8. #8
    Senior Member Bitsyncmaster's Avatar
    Join Date:  May 2011

    Location:  Leonardtown, MD

    Posts:    7,291

    My VIN:    03572

    I bought my D with 22,000 miles on it and I run MOBIL 1 since. Last year I did valve gaskets and could not believe how clean the valve covers were. I've rebuilt many other engines in my life and valve covers always have a lot of gunk in them.
    Dave M vin 03572
    http://dm-eng.weebly.com/

  9. #9
    Linux Janitor novadmc's Avatar
    Join Date:  Aug 2014

    Location:  Fairfax, VA

    Posts:    246

    My VIN:    4055

    Club(s):   (DMA)

    Quote Originally Posted by 81dmc View Post
    Standard. I use Castrol GTX 20W50.
    same here. I change it once a year (since i only drive about 1500-2000mi/year)

  10. #10
    Guy with a DeLorean Mark D's Avatar
    Join Date:  May 2011

    Location:  Stevens Point,WI

    Posts:    1,989

    My VIN:    6125

    Same here, I use Castrol GTX 20W-50.

Page 1 of 13 1 2 3 11 ... LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •