Does Mobil 1 Contain the Additive for Flat Tappet Cams

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-	Why Use Mobil 1 0W-40 Instead of Mobil 1 10W-30 in Newer BMWs
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-	Should a Car Driven 11,000-Miles/Year Stay on Mobil 1 or be Switched to Extended Performance?
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-	Will Using Synthetics After 30,000 Miles Dry Out Seals and Gaskets?
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-	Using 0W-40 Motor Oil Instead of 5W-20
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-	Does Mobil 1 Extended Performance 15W-50 Meet JASO Standards?
-	Will Higher Mileage Vehicles Leak More When Switched to Synthetic Oil?
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-	Does Mobil 1 Contain the Additive for Flat Tappet Cams?
-	Do Short Trips Require More Frequent Change-outs When Using Mobil 1 Extended Performance?
-	Containment of Dirt in Engine Oil During Extended Oil Drains
-	Any Problem Having Residual Conventional Oil in the Engine When Switching to Synthetic?
-	Response to Claims that Products Contain Mostly Mineral Oil
-	Future of 5-Quart Jugs of Mobil 1 at Wal-Mart
-	Mobil 1 Synthetic ATF and Mercon Approvals
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-	Why is Mobil 1, and Not Mobil 1 Extended Performance, Recommended for Newer Corvettes?
-	Is Synthetic Oil Thinner than 'Regular' Oil?
-	Expected Burn Rate for Synthetic vs. Conventional Oil
-	Does Mobil 1 or AMSOIL Provide Best Protection for Longer Drain Intervals?
-	How Do Turbocharged Engines Benefit From Mobil 1
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-	Does Mobil Have a Synthetic Equivalent for 15W-40?
-	Using an SM-Rated Oil When an SG-Rating is Recommended
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-	Changing to Synthetic Oil in a New Car
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-	Any Way to Tell if Mobil 1 Was Installed?
-	Lack of a 10W-60 Viscosity in the Mobil Synthetic Product Line
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-	Does Switch to Synthetics Cause 'Dry' Engines to Begin Leaking
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-	Are Chances of Contamination Increased with Longer Change Intervals
-	Mobil Product to Use for Diesel Engines Calling for 15W-40
-	Does Teflon from Oil Filters Impact Oil Performance
-	Use of Mobil 1 in Place of Harley Davidson 20W-50 Oil
-	Response to Amsoil Competitive Claims
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-	Availability of Mobil 1 Extended Performance 15W-50
-	Shelf Life of Unopened Mobil 1 Quarts
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-	Oil Change Interval for Mobil 1 Turbo Diesel 5W-40 in a Dodge W2500 Pickup
-	Motor Oil for a Triumph Bonneville
-	Use of Additives with Mobil Engine Oils
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-	Applicability of Synthetic Motor Oil in a 2003 Chevrolet Impala
-	Judging Viscosity Ranges of Multi-Grade Oils
-	Switching to Mobil 1 In High-Mileage Cars
-	Long Drain Intervals in a BMW
-	Mobil 1 vs Mobil Delvac 1 for a Gasoline Engine
-	Switching From Conventional Motor Oil to Mobil 1
-	Oil Change Intervals in a Low-Mileage Mercedes
-	Protecting an Infrequently Used Engine
-	Storing Opened Bottles of Oil

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Question:

Does Mobil 1 Contain the Additive for Flat Tappet Cams?

I build a few engines a year as I do muscle car repairs and I have been having a lot of camshaft failures. I just read that it is because the oil no longer has the additive for flat tappet cams. Can I use Mobil 1 to break in fresh rebuilt engines of '60s and '70s tech? Is it too slippery for new ring break-in? Will it give protection on new cam and lifters?

-- Frederick Neidlinger, Dover/Dover AFB, DE

Answer:

For older, flat tappet engines where wear may be more of a concern, we offer a number of oil products which are higher in phosphorus than API SM/ILSAC GF-4 oils. These include Mobil 1 15W-50, Mobil 1 Extended Performance 15W-50 (1200 ppm phosphorus), Mobil 1 0W-40 (1,000 ppm) and Mobil 1 High Mileage 10W-30 and 10W-40 (1000 ppm). For all newer engines and flat tappet engines in normal service, API SM/ISLAC GF-4 oils are preferred for better fuel economy and for the protection of catalytic systems with lower phosphorous (800 ppm).


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