Brand new Longblock (¾ actually with injectors, rail) new turbo, egr valve, delta-P and crossover. Had heavy blowby in the first 500 miles. Replaced the intake manifold pressure sensor. It consistently throws 3 codes:
SPN 3936 FMI 18
SPN 3464 FMI 16
SPN 102 FMI 16 (rarely)
There's 5,000 miles on the engine now and I changed the initial break in oil Rotella T4 15W40 at 2,000 miles with fresh T4.
I think blow-by gasses having clogged up my One-Box are the reason it's throwing these codes. I'd like initiate a parked regen but I'm reluctant to subject it to 45 minutes of high idle, reaching temperatures as high as 1200°. Am i being overly cautious? The opinions on a break-in period vary from 2,500 miles to 20,000. I called Detroit and they had trouble giving me a straight answer on the first oil change. They seemed to persistently relegate back to a time frame between standard oil changes.
How many miles to parked regen a brand new factory DD15 GHG14?
Break-in new DD15 until safe to Parked Regen
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Lockport, Aug 29, 2025.
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I would regen, leave the hood open during regen if it concerns you. -
KDHCryo Thanks this.
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Follow up: At the end of the day it would seem the exhaust bellows had split under the different characteristics of the new engine and it was playing havoc with the input pressure at the One-Box.
I'd also found a significant amount of water in my air tanks and think this was the root of the SPN 102 at the Assymetrical Turbocharger Wastegate Solenoid as its air actuated.dosgatos Thanks this. -
You can run a regen right away. I put a new head on my DD15 40K miles ago. I ran a regen in the shop parking lot, just to make sure everything was going to stay together.
FYI You should get better mileage running 10W30 oil. I run T5 semi synthetic.
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