Euro 4 vs Euro 3 - DPF and impact on oil quality
This paper concludes the Euro 4 (D5244T4) 185 benefits from a 6 monthly oil change, whereas Euro 3 (D5244T) 163 which doesn't have the DPF has no impact on oil quality.
https://dk.upce.cz/bitstream/handle/...=1&isAllowed=y
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2003 - 1G XC90 D5 Euro3, replaced AWD and gearbox at 140k (April 2022 @196k)
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