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Discussion Starter #1
For all of you with non-roller cam cars who are still using the old favorite Mobil 1 5W-30 (which I used for years) I have a valuable tip.
Stop using it!
Mobil 1 has reduced the level of ZDDP (Zinc) in most of their oils to meet current standards that are in place to prolong catalytic life. Unfortunately, zinc is vital in car with a non-roller cam to prevent early cam failure. Their new 15W-50 was introduced to address this issue but the 5W-30 is not acceptable. You should not use any oil with a zinc concentration of less than 1200ppm and 1300-1400ppm is best. All of Amsoil's synthetics have a concentration in the high 1300's which is perfect. Royal Purple has a good product too. Amsoils recommended drain interval for their synthetics is 25,000 miles or 1 year.
 

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Discussion Starter #3
add a link to prove this statement please
There have been several good articles on this lately. I think Mopar Enthusiast had one. Just Google the name of your favorite oil and "ZDDP ppm" and see what comes up. The new standards require lower concentrations of zinc because it causes deterioration of the catalytic. Unfortunately, Mobil doesn't seem to be willing to list the actual zinc concentration in their oils, not even in the new 15W-50 that was introduced to address the low-ZDDP problem. You can also Google "ZDDP, flat tappet" or just "ZDDP" for more info. I know it is hard to swallow, I used Mobil 1 religiously for years, but it is a genuine problem. Amsoil had this lengthy response to a question about this issue:

OBJECTIVE:
Provide facts outlining lubrication requirements of flat tap-pet and camshaft style engines and the effect of motor oil additives containing higher levels of zinc/phosphorus.
ISSUES:
Engine oils contain anti-wear additives and the most common anti-wear chemistry is zinc dialkyldithiophosphate (ZnDDP), which contains a combination of zinc and phosphorus. In 2005, in an effort to guarantee catalytic converter performance in new vehicles, the American Petroleum Institute (API) and International Lubricants Standards Approval Committee (ILSAC) instituted API SM and IL-SAC GF-4 quality standards which reduced the maximum limit for phosphorus to 0.085% and 0.080% respectively. Both API SM and ILSAC GF-4 specifications also contain a minimum phosphorus content of .065% and .060%.
Previously, API SL/ILSAC GF-3 oils were restricted to 0.10% phosphorus level, so a concern arose that oils containing lower levels of zinc/phosphorus could provide insufficient protection in high pressure areas of flat tappets and camshaft lobes found in many older cars and high-performance engines.
TECHNICAL DISCUSSION:
Proper assembly lubes and oil additives should be used during the break-in phase for all new or rebuilt engines with flat tappets. These additives provide the extra protection required at the point of contact during break-in to help the flat tappet face to properly mate with the cam lobe. Once the break-in phase is completed, these additives should not be used because of other engine life issues created by long term use of these materials. AMSOIL does not provide break-in assembly lubricants, but one of the common products is GM E.O.S., which is an assembly lubricant and is not, as stated by GM, an engine oil additive. AMSOIL does not recommend using any engine oil additives with AM-SOIL engine lubricants.
High-performance modified engines benefit from oils with superior film strength and anti-wear properties. The flat tappet/camshaft lobe interface is the one area in an engine that has extreme contact load. This load increases significantly where non-stock, high-pressure valve springs are employed so the use of properly formulated engine lubricants is extremely important to reduce wear and extend flat tap-pet/camshaft life. In these applications, AMSOIL recommends motor oils containing high levels of zinc/phosphorus for superior protection.
RECOMMENDATION:
AMSOIL AMO, ARO, HDD, TRO, and AHR all contain high levels of zinc/phosphorus maximizing flat tappet/camshaft life in stock and modified applications.
AMSOIL 10W-40 (AMO) and 20W-50 (ARO) are premium synthetic formulations which are recommended for API SL (gasoline)/CI-4 Plus (heavy-duty, on-road diesel) specified applications. They are an outstanding choice where high zinc containing protection is required in late model hot rods requiring extra camshaft protection.
AMSOIL (HDD) is a 5W-30 weight combination diesel/gasoline oil with a higher starting TBN to handle the significant stresses from high soot loading and acid generation in modern diesel engines. HDD contains the high phosphorus and zinc required for long life.


TSB: MO-2007-08-08
Date: 8/3/2007
Page 1 of 2
Subject: Flat Tappet and Camshaft Lobe Lubrication
Technical Service Bulletin
Product Description: AMSOIL Synthetic Motor Oils
Submitted By: TSSTPM
Reviewed By: DP
Approval By: COO Date:
Distribution: ___Internal _X_All
AMSOIL INC., AMSOIL Bldg., Superior, WI 54880 (715) 392-7101 © Copyright 2006
Submitted By: DP
AA Date: 08/08/07
AMSOIL Product Name Phosphorus Level

THE LAST TWO NUMBERS HERE ARE THE PHOSPHORUS LEVEL THEN ZINC LEVEL
AMO 10W-40 Synthetic Premium Protection 1265 1378
ARO 20W-50 Synthetic Premium Protection 1266 1379
HDD Series 3000 Synthetic 5W-30 Diesel Oil 1266 1379
TRO 20W-50 Synthetic Racing Oil 1235 1370
AHR SAE 60 Synthetic Racing Oil 1265 1375

AMSOIL 20W-50 (TRO) is a premium synthetic racing oil with superior film strength and anti-wear protection for gasoline engines. It is an excellent choice for street or race cars, hot rods, trucks or boats. TRO is the preferred choice for highly modified, high horsepower engines requiring the extra protection required by flat tappet camshaft engines.
AMSOIL (AHR) is a super heavy weight racing oil de-signed for alcohol and nitro burning race engines where viscosity loss associated with fuel dilution is a concern. AHR includes a high dose of zinc containing anti-wear chemistry that performance engines require.
 

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Do not know if it is right or wrong and I am not endorsing anybody's product,just adding more info to help people make an informed decision. This is what Mobil says :

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 thru a component called ZDDP. For products that meet the new ILSAC GF-4 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 products which have a higher level of phosphorus (phos) and can be used in engines in racing or high performance applications; see the attached table.
 

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Discussion Starter #7
More info is always good. Sure, manufacturers "say" it is enough for older engines so people will keep buying their oil. Mobil acknowledged the problem when they released the reformulated 15W-50 but that is the only product they have so far that has an acceptable concentration of ZDDP and most manufacturers have done nothing. As I said, Amsoil and Royal Purple have good products for us and Amsoil is the most open and up-front about what exactly is in their products. Independent testing shows that their products out-perform all of the competition in just about every measurable category. That is why I switched to them long before I heard about this new issue.
 

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OK,I have a question.
Engine Oil technology has supposedly improved over the years so what are the differences between the additive packages of todays oils and the oils that were available in the late 80's,early 90's when our vehicles were new?
 
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