RanchoPower

http://www.enginebuildermag.com/Article/68638/why_do_camshafts_fail.aspx

AMO 10W-40 Synthetic

Premium Protection Motor Oil 1265 1378

ARO 20W-50 Synthetic

Premium Protection Motor Oil 1266 1379

HDD Series 3000 Synthetic

5W-30 Heavy Duty Diesel Oil 1266 1379

AME 15W-40 Synthetic Heavy

Duty Diesel and Marine Motor Oil 1267 1377

AMSOIL Synthetic Racing Oils Phosphorus Zinc Level

Level (ppm) (ppm)

RD20 Dominator Synthetic

Racing Oil 5W-20 1424 1575

RD30 Dominator Synthetic

Racing Oil 10W-30 1424 1575

RD50 Dominator Synthetic

Racing Oil 15W-50 1424 1575

AHR SAE 60 Synthetic Super

Heavy Weight Racing Oil 1265 1375

The most commonly used anti-wear additive in motor oils is

zinc dialkyldithiophosphate (ZDDP). ZDDP contains both

zinc and phosphorus components working together to provide

anti-wear protection, and is most important during cam

“break-in” procedures. Proper break-in lubes should be used

during the break-in phase for all new or rebuilt engines with

flat tappets. These lubricants provide the extra protection

required to reduce wear at the point of contact during break-in

and help the flat tappet face properly mate with the cam lobe.

Once the break-in phase is completed, AMSOIL motor oils,

which are formulated with high levels of zinc and phosphorus,

will provide premium protection to flat tappet cams.

The American Petroleum Institute (API) and International

Lubricants Standards Approval Committee (ILSAC) have

mandated the reduction of phosphorus to extend catalytic converter

life. However, reducing the level of ZDDP can compromise

protection to engine components, most notably in flat

tappet camshafts. Current API SM and ILSAC GF-4 specifications

for gasoline engines have maximum and minimum

phosphorus levels of 800 ppm and 600 ppm, respectively, for

SAE 0W-20, SAE 5W-20, SAE 0W-30, SAE 5W-30 and SAE

10W-30 motor oils. All other gasoline SAE grades do not

have a mandated phosphorus limit.

All engines, especially 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. Since this load

increases significantly when non-stock, high-pressure valve

springs are employed, the use of properly formulated motor

oils is extremely important to reduce wear and extend flat tappet/

camshaft life.

RECOMMENDATION:

AHR all contain high levels of zinc/phosphorus, maximizing

flat tappet/camshaft life in stock modified and high-performance

applications.

AMSOIL 10W-40 (AMO) and 20W-50 (ARO) Synthetic

Premium Protection Motor Oils are formulated with high zinc

and phosphorus levels to provide protection in both gasoline

(SL) and diesel (CI-4 Plus) applications. These oils are an outstanding

choice where high zinc-containing protection is

required, such as in late model hot rods that require extra

camshaft protection.

AMSOIL Series 3000 Synthetic 5W-30 Heavy Duty Diesel

Oil (HDD) is a 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

engine protection.

AMSOIL 15W-40 Synthetic Heavy Duty Diesel and Marine

Motor Oil (AME) is engineered for use in a wide variety of

light and heavy-duty applications. AME is formulated with

high levels of zinc and phosphorus to ensure protection of flat

tappet camshaft lobes in high performance diesel engines.

AMSOIL Dominator Synthetic 5W-20, 10W-30 and 15W-50

Racing Oils (RD20, RD30, RD50) are all formulated with the

same robust additive package. These oils are heavily fortified

with zinc and phosphorus to protect flat tappet cams in the

most extreme racing conditions.

AMSOIL SAE 60 Synthetic Super Heavy Weight Racing Oil

(AHR) is a super heavy weight racing oil designed 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 race engines require.