synthetic oil

[beartrace]

Is it really necessary to use a bypass filtration system when using extended drain intervals? How many people are using extended drain intervals without a bypass system?

 

[amsoilman]

Here's a little more info on the Amsoil 15W-40 and the 5W-30 oils.



AMSOIL recommends both the 15W-40 marine and the 5W-30 for diesel use, although the series 2000 5W-30 is currently the most advanced diesel oil available. The reason for this is mostly in two of its additives. One is its VI (viscosity improver) additive, and the other is its wear additive package.



The VI additive allows the use of multi viscosity oil that WILL NOT shear back to a lower viscosity under any normal operating conditions for the expected maximum drain interval, which is well over 100,000 miles.

The big fear is that multi viscosity oils will shear back to a lower viscosity and the 40 wt top end is there to give the needed protection if it does. Most diesel engines run best with a 30 wt max viscosity oil and AMSOIL is the first U. S. Company to offer a multi viscosity oil with the additive package to do it.

I believe AMSOIL is the only oil available in the U. S. that uses this particular additive, although it is extensively used in Europe where synthetic oils are mandatory with much longer drain intervals than U. S. manufactures now recommend.



This additive is made by the Lubrizol Company.



The anti wear additive package came about because of the EPA lowering the allowable level of phosphorus ( my spelling is lousy)in many engine oils. Phosphorus and Zink are universally used in anti wear packages because of its effectiveness and low price. The EPA feels that in engines that consume large amounts of oil that the phosphorus will make catalytic converters less effective so they lowered the amount of it in many oils. Most manufacturers use less of this additive and this shows in the 4 ball wear testing from oils made 5 years ago and current oils.

AMSOIL decided to find another additive which would give the same or better protection at a reasonable price. They found one but it is more expensive. AMSOIL decided to start the Series 2000 and 3000 oils that use this chemistry as their top of the line oils and keep their current line for a choice for the consumer.



As far as Viscosity is concerned, all oils have to fall within the limits of their respective grade in order to be graded. Ie. a 40 grade oil has to be between the limits of 12. 5 cSt and 16. 3 cSt @100 C. The 30 grade oil has to be between 9. 3 cSt and 12. 4 cSt @ 100 C.



In the case of Amsoil, their 15W-40 is 15. 0 cSt@100C. The 5W-30 is 11. 4 cSt@100 C.



In my own application, I had 31,000 miles on the 5W-30 series 3000 oil in my truck at the last oil analysis. The Viscosity level at that time was 11. 1 cSt@100 C.



The figures I have given are Kinematic Viscosity.



Wayne

amsoilman

 

[Riflesmith]

Lee Weber,

I would like to compliment you on your last post. It was the most informative, unbiased, well-rounded post on engine oil that has ever been posted on this site. Thanks for the info.

 

[Sled Puller]

Lees Post should be printed in the mag, excellent!

 

[mimprevento]

Thanks

Appreciate the help Lee Weber I am a Mobil oil fan and will use the Delvac heavier viscosity synthetic because it is already in the 90's in the Old Dominion. I appreciate the answer to my question in your great post I was starting to think I had BO!!!!!