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For the past several years I've been having UOA (Used Oil Analysis) done on my T5 '99 9³. The UOA results using Mobil 1 5W-40 showed that a 10k mi/1+ yr OCI (Oil Change Interval) was fine on that engine, & even better if you changed the filter at 5k mi. Now that I have a T7 '02 9³, I won't go longer than 5k mi on the oil. The changes to the engine controls & EGR setup creates more opportunity for sludge formation.
posted by 71.212.145...
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