40 weight oil for Detroit's

[Walter P]

Rather than research which oil is best for the old Detroit's I just kept using the Detroit Diesel brand which
I know is probably just a rebranded formulation made by one of the major oil companies. I think the
stuff I used was made by Mobil oil company. It is still available but costs a little more but it's still worth
it to not mess up an engine which would cost many $ to repair.

Walt

[MadHatter53]

Yes you can always google it and get some answers but what fun is that? Start a post here and get some good info, some sarcasm and some attitude in one shot.

[Photolomy]

Any tips on doing an oil change on 8v71TIs and trans? Should I run them first to warm up the oil, lol, though I am in Florida. Drain the oil before removing the filters?

[Briankinley2004]

You need to run first but it will take a while to drain back down completely, at least my 12V71's do. Maybe 20-30 minutes. First time I ran the engines I went back to the dock and immediately checked oil. It would barely show on dipstick and I was nervous. Waited an hour or so and checked again. Sure enough it was in between the lines.

[rawlings2016]

Hi I came upon this thread. I have a detroit 6-71 inline on a crown coach bus. I need to change the oil this summer and I am looking around. When I purchased this bus in California it had just been partially rebuilt. Mechanics mentioned it was the heads had blown off. I have had the bus for almost a year and have driven it about 2900 miles on different trips. I was told to continue using delo400 sae 40 wt. as that is what it currently has and every 1,000 miles it took about 1 gallon of oil. I havent had any issues yet. Should I continue to use delo 400 for this engine or should I flush the oil for Delo 100 or Mobil Delvac 1240? Delo 400 is easy to find in most auto stores while I am guessing the Delo 100 or Mobile Delvac 1240 has to be ordered.

Also I will run engine for a while, let it warm the oil, then shut engine wait 30-60 minutes for oil to go back down to pan and then do I flush oil from pan first then swap the filters? Put oil into new filters to remove any air? I would really appreciate any feedback

[Play'N Hooky Too]

NAPA's house brand SAE 40 (NAPA Part #75118) meets the DD specs and is $59 for a 5-gallon bucket at my local store here in Lower Alabama.

[SKYCHENEY]

Don't use the 400. The oil needs to be CF2 rated.

And I'd like to see a picture of the Crown. What year?