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Will Switching to an Oil with More Phosphorous Adversely Impact a Ford Explorer?
 
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Question:
Will Switching to a Motor Oil with More Phosphorous Adversely Impact a Ford Explorer?
I've been running Mobil 1 10W-30 in my Ford Explorer V6 SOHC for years now. Thought I would switch to Mobil 1 0W-40 for a variety of reasons. Is this oil OK with an OHC engine and will the change from 800/900 Phosphorus/Zinc to 1000/1100 cause me any problems with the catalytic converter or elsewhere? 2002 Ford Explorer, 125,000 miles, 4.0L SOHC. Thank you.
-- Brad Davis, Cary, NC
Answer:
Mobil 1 0W-40 is an outstanding product, and with the 40 grade high temperature viscosity it can help control oil consumption in higher mileage vehicles. As far as the higher phosphorus content and its impact on catalytic equipment, phosphorus carried over due to oil consumption will shorten the life of emission control equipment. If your vehicle is not having oil consumption problems then the impact on catalytic converter life will be minimized but still should be considered. For vehicles having oil consumption issues, higher phosphorus oil will shorten the converter's life.
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