40 weight Detroit oil ???

[scanzel]

Where are you finding 40wt oil for our old detroit and what are the specifications. My book only shows MIL grade numbers. 

[Nova Eona]

Delo 100 is the gold standard, but I use Miles All-Spec; meets the certification requirements and it's significantly cheaper and more available (Amazon can deliver it).

[TomC]

Summit Racing has Mobil Delvac 40 that they will ship directly to your house.

[lvmci]

Try the mobil delvac, I think you'll be happy with the results...

[edvanland]

I get Shell Rotolo from Tractor Supply

[bronson]

I found O'Reilly  auto parts to be the cheapest for delo 100

[RJ]

Steve -

Perhaps this will help:

https://www.facebook.com/groups/prevostxl/permalink/2979173798982539

IF the link doesn't work, PM me and I'll send you the .pdf file.

FYI, when I first got my MCI, there was a case of Chevron's Delo 100 in one of the bays. I used that, and was having to add a gallon about every 800-900 miles.  After finding out that Detroit's Power Guard 40, the factory fill oil, was actually Mobil Delvac 1240 that was private labeled, I switched to that on my next oil change. Interestingly, my oil consumption dropped, with the Delvac I was now going about 1500 miles before having to add a gallon.

That's just been my experience with those two brands. I've never used Shell's Rotella T, or the Miles Spec, so I can't comment on those. Rotella seems to be popular primarily because it's a little easier to find and also a little less expensive.

FWIW & HTH. . .   

[Lin]

Ditto on the reduced oil consumption in switching from Delo to Delvac. 

[Van]

Ditto on the reduced oil consumption. Summit racing has it on sale now at $15.25 a gallon now. https://www.summitracing.com/parts/mob-104056-1
Dello goes through a two stroke like $#!% through a Goose IMO.

[luvrbus]

LOL took me years of bashing here to even get you guys to try Delvac 1240

[RJ]

Summit racing has it on sale now at $15.25 a gallon. https://www.summitracing.com/parts/mob-104056-1

Thanks for the tip, Bill! I know they put it on sale periodically, so the timing is right for today's discussion!

Delvac comes four gallons to a case, so I just ordered two cases (8 gallons), enough for an oil change for my engine. I already have three gallons, so I'll still have some spares.

Hidden bonus: Free shipping if your order is over $99, so, with sales tax, my order came to $132.77. Your price may vary due to sales tax differences.

FWIW & HTH. . . 

[Nova Eona]

Looks like the 5 gallon pails are on sale as well, $13.50/gallon
https://www.summitracing.com/parts/mob-102565?rrec=true

[Lee Bradley]

Thanks guys. I ordered 20 gallons.

[dtcerrato]

Just ordered a pale, Thanks!

[twochain]

Many thanks for the heads up!  I have been waiting for the 1240 to go on sale again at Summit Racing and just grabbed a few pails myself.