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Mixing Motor Oil to Reach the Right ZDDP Level for Classic Cars
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Question: Mixing Motor Oil to Reach the Right ZDDP Level for Classic Cars For an older, flat tappet, performance motor with inherent cam wear issues is there any benefit to mixing high ZDDP Mobil 1 Racing 4T 10W-40 to Mobil 1 High Mileage 0W-30 oil? The 15W-50 creates TOO MUCH oil pressure. It would be nice if you had a product for 'Classic' cars, high ZDDP, 0W-30 and 0W-40. I have used nothing but Mobil 1 for 15+ years. -- Bill McCauley, Tallmadge, OH
Answer: Mobil 1 0W-40 already contains a higher level of ZDDP (1000 ppm) that could benefit your flat tappet engine. We also have a Mobil 1 High Mileage 10W-40 (1000 ppm); see our table listing the phosphorous levels for all Mobil 1 synthetic motor oils.
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Question:
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 from the oil. I was told by two separate racing engine builders that the EPA ordered the removal of the zinc from over-the-counter motor oil. I use Mobil 1 5W-20. Is this true and do you think a zinc additive might help?
-- Randy Lovejoy, Americas, GA
Answer:
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 must be less than 800 ppm phosphorus. The ILSAC level for phosphorus has been reduced to protect the catalytic converter and other emission protection equipment. The engine manufacturers
are confident that this level of phosphorus will protect both new and older engines. However, there are Mobil 1 synthetic oils which have a higher level of phosphorus (phos) and can be used in engines in racing or high performance applications; see the attached table.
Answer updated April 2012