Question for the smart guys-The printed matter that I could find all suggest that you not use diesel oil in a car with emission equip, due to the high zddp & phosperous fouling the cats & sensor.
I'm having trouble understanding - the car is an 86 porsche 928 with a cat & o2 sensor. Not able to find any info on zddp levels etc of oils from '86 until they reduced the levels. It was probably 20+ years of using the previous levels of zddp & phos. & the cats still work. I can understand not using diesel oil in a modern car , but if it was ok (& the only thing you could get) to use high zddp & phos what has changed?
Oil in question is Valvoline Premium Blue 15/40- per valvoline:
thank you for contacting Valvoline Product Support. Our current CK-4 formulation of Premium Blue 8600 ES 15W-40 motor oil contains 1,210 ppm zinc and 1,100 ppm phosphorus.
I'm having trouble understanding - the car is an 86 porsche 928 with a cat & o2 sensor. Not able to find any info on zddp levels etc of oils from '86 until they reduced the levels. It was probably 20+ years of using the previous levels of zddp & phos. & the cats still work. I can understand not using diesel oil in a modern car , but if it was ok (& the only thing you could get) to use high zddp & phos what has changed?
Oil in question is Valvoline Premium Blue 15/40- per valvoline:
thank you for contacting Valvoline Product Support. Our current CK-4 formulation of Premium Blue 8600 ES 15W-40 motor oil contains 1,210 ppm zinc and 1,100 ppm phosphorus.
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