The Saab 9-3 TTiD and Lancia Delta 1.9 Twin Turbo share core diesel hardware, yet their factory oil recommendations differ. Saab chose 0W-40 C3; Lancia specified 5W-40 FIAT Z2. The reasons reach back further than most service counters remember. The post Same Engine, Different Oil Doctrine: Why Saab and Lancia Chose Different Oils for the 1.9 Twin-Turbo Diesel first appeared on SAAB Planet.
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