Practical notes for keeping diesel fleets moving.
Field-led articles on emissions faults, delete units, remapping and the decisions operators face when a machine is stuck in derate.
What causes AdBlue faults in heavy diesel fleets?
The common SCR, DEF and NOx faults that keep trucks and plant off the road, and how Optima decides whether a delete unit, emulator or remap is the right fix.
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DPF regeneration problems that keep coming back
Why blocked filters, failed regens and derate cycles return on hard-working diesels, especially where the duty cycle never matches the factory assumptions.
ECU remapping for torque, economy and uptime
How a proper diesel calibration can improve drivability without treating every truck, tractor or loader like it lives on the same dyno sheet.
Urea Shortages Affecting Fleets: December 2021
Archived December 2021 update on urea supply concerns affecting Australian and New Zealand fleets, with the original ABC News article link.
COVID-19 Alert Level 3: April 2020 Update
Archived April 2020 update on Optima’s contactless service, cleaning measures and customer arrangements during New Zealand’s COVID-19 Alert Level 3.
Ex-NZ Dairy Company Volvos: AdBlue System Issues
Optima’s April 2019 note on ex-NZ dairy company Volvo trucks, covering exhaust positioning, water in wiring looms and plug-and-play AdBlue delete units.
Volvo Off-Highway AdBlue and DPF Delete Modules
Optima’s April 2019 update on AdBlue and DPF delete modules for Volvo off-highway loaders, excavators and dump trucks.
LandCruiser 79 Series Tuning, DPF and EGR Work
A 2019 Optima workshop note on diagnosing a missing vacuum hose before tuning a LandCruiser 79 Series and carrying out DPF and EGR work.
Euro 5 AdBlue Delete Vehicle Coverage
Optima’s March 2019 Euro 5 vehicle coverage update, covering AdBlue, DEF and SCR delete applications for trucks, buses and machinery.
Euro 6 AdBlue and DPF Delete Vehicle Coverage
Optima’s March 2019 Euro 6 coverage update for Mercedes-Benz, Scania, Volvo, Renault, MAN and Iveco AdBlue and DPF delete applications.
AdBlue (SCR) Removal
AdBlue and SCR explained: how the system works, why faults occur and the vehicle types Optima supports with AdBlue delete solutions.
Diesel Engine Oils and Additives: What to Consider
Optima’s December 2018 article on diesel engine oil specifications, additives, low-SAPS oils and the potential effects on DPF and EGR systems.
Diesel Engine Idling and Warm-Up Advice
Optima’s December 2018 article on diesel engine idling, cold starts and warm-up routines, and their effects on fuel use and engine wear.