Originally Posted By: TiredTrucker
I have not run 10w30 in my Detroit 60, but the Detroit Lube manual does say it can be used in the 60 as long as it meets 93K214 (CI-4+) or 93K218 (CJ-4) standards. The DD15 is factory filled with 10w30, so you can run 10w30 in that one comfortably. I have never heard of any software update to change to 10w30 on the DD15. First I ever heard of such a thing.
For the Series 60, I would take a strong look at the Amsoil 10w30/30w ACD oil. It is a straight 30 with no viscosity improvers, yet it meets the 10w30 standard. It is a CI-4+ oil so would be fine in the Detroit 60, but NOT in the DD15 because of the emissions stuff. In the 15, it has to be a CJ-4 oil. The Amsoil ACD should be a killer oil in the 60. Sure won't get sheared, which is common with the 60. But that being said, if you want one oil for both motors, I have heard nothing but good things about the Mobil 10w30 synthetic blend. The place where I get my oil changed is stocking it now, as is a lot of other locations. That might be a viable option for both motors.
I am sitting on a healthy supply of Schaeffer 15w40 synthetic blend, but when I get to the end of it, I am considering giving the Amsoil ACD a go myself.
On the 60, make sure you take an oil sample on a 10w30 each time just to track it and see if it is going to work out fine.
Well I will switch to 10w30 for sure in the DD15, just not sure on the 60 series now. It has 725K on it and has been really reliable on 15w40 and I dont want to mess it up. I might just run it for an oil change interval and post up to UOA on it and see. Thanks for the info!