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Ask Mobil Archive -
Catalytic Converters
DateQuestionAnswer
04/06/2010
Using a CJ-4 Motor Oil in a Gas Engine Having a Catalytic Converter
Is it OK to use a CJ-4 oil in a gasoline engine with a catalytic converter?
From an engine performance viewpoint, the API CJ-4 oil should provide adequate protection. But this heavy-duty viscosity grade has a higher level of phosphorus than typical ILSAC GF-5/API SN oils desi...
01/12/2010
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...
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 it...
01/04/2008
Impact of Phosphorous Levels in Mobil 1 Motorcycle Oil on Catalytic Converters
Although I've known for some time now that phosphorus was damaging to emissions equipment, specifically the catalytic converter, I just assumed all consumer-level Mobil 1 oils were "safe" until I saw ...
We have no information that the level of phosphorus in Mobil 1 Racing 4T is going to significantly shorten the life of your catalytic converter. Catalyst poisoning from Phosphorus is a well known issu...
05/25/2007
Has Zinc Been Removed from Motor Oils?
I am having thrust bearing failure in a 4.6 modified performance engine. This is a street/strip engine. Many of my friends are having the same problem. I think it is the result of the removal of zinc ...
The active ingredient that you are talking about is phosphorus which is added through a component called ZDDP. For products that meet the new ILSAC GF-5 specification the phosphorus levels for the oil...
12/14/2006
Using 0W-40 Motor Oil Instead of 5W-20
I have a 2004 Honda Accord 2.4L that I recently installed 0W-40 in although Honda recommends 5W-20. With regard to engineering tolerances, I'm skeptical that there could be much difference between Mer...
In general we recommend that you follow the OEM recommended viscosity grade, especially during the warranty period. Although, we think there is very little chance that you will have any issues using M...
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