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Ask Mobil Archive -
Phosphorous Levels
DateQuestionAnswer
10/06/2009
Correct Motor Oil Viscosity for Cars with Hydraulic Lifters
Will your Mobil 1™ 15W-50 give my '67 Corvette and my '62 Skylark with a recent rebuilt engine the proper lubrication for the hydraulic lifters sliding on the cam?
The short answer is yes. Mobil 1™ 15W-50 has a higher level of phosphorus (zinc) preferred for older sliding valve trains in higher performance vehicles.
01/05/2009
Best Oil for Street Legal Drag Car
Dear Mobil 1, I race a 700hp drag car that is street legal. The motor is a 505c.i. BB Mopar with solid lifter cam with .674 lift. I am currently using the Mercedes-Benz SLR spec Mobil 1 5W-50 oil. (9 ...
If it isn’t broke don’t fix it. Stay with the product you are using and having good results with. However, if you want to see if you can get a little more power (who doesn’t), we recommend you try Mob...
07/01/2008
Any Problem Running Motorcycle Oil in an Older European Race Car?
My older sports car came with 20W-50 from the factory. My mechanic recommends using 20W-50 Mobil 1 (V-Twin Motorcycle Oil) over the 15W-50 Mobil 1. Since this is a pre-catalytic converter era car he p...
The most important difference between a motorcycle formulation and an automotive formulation is that the automotive oils contain friction modifiers for improved fuel economy. Frankly, you are using 50...
05/05/2008
What's the Zinc Level Mobil 1 15W-50?
Hello, I read your answer about ZDDP and phosphorus levels. You even list the phosphorus level in your table, but you show no listing for the level of zinc. Other oil companies also list their zinc le...
The important element here is the phosphorus since it is the active antiwear additive.  That's why we show phosphorus as well as zinc.  The zinc content is in the range of 0.12 - 0.13 weight percent (...
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...
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