a number of owners are still not aware that Delo400 has been reformulated a few years back and is no longer recommended in DD 53, 71 and 92s. Delo 100 is correct oil... (or Rotella straight 40 or Detroit branded oil)
http://www.samsmarine.com/Manuals/Ch...Delo%20400.htm
figure i'd post the link here in the FAQ
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Oil for older Detroits, use Delo100 not 400
Pascal
Miami, FL
1970 53 MY #325 Cummins 6CTAs
2014 26' gaff rigged sloop
12' Westphal Cat boat