I was online reading forums about the best diesel oils and how to compare diesel oils for the best overall performance and I have mentioned this before, but I will again because I keep seeing this all over the internet and that is no matter what oil related site you are on especially the forums it appears there is never any concrete evidence of which oil is really best. All that really comes from these “discussions” is individuals touting the oil they use and its rare they can actually give real world comparisons.
Yes, you are on an Amsoil Dealers website and yes there is a picture of an Amsoil bottle so the logical conclusion is I’m going to tell you Amsoil is the best diesel oil right? No, not exactly instead of telling you why I think Amsoil is the best diesel oil I’m going to show you and teach you what to look for before you ever put one quart in your vehicle. If you don’t know what a product data sheet is you should because at a quick glance you can make several key decisions before actually using the oil in your motor.
All motor oils go through extensive testing before they can be labeled and sold and of course minimum standards that need to be met. There are over a dozen different test an oil must go through before it is sold, but to keep things as simple as possible I will demonstrate the four easiest ones to understand and this will give you the background you’ll need to learn how to compare diesel oils.
The Four Test Are:
- Viscosity Index (ASTM D 2270)
- Flash Point (ASTM D 92)
- NOACK Volatility, % weight loss (ASTM D 5800)
- Total Base Number (ASTM D 2896)
The viscosity index can be misleading at times because some oil manufacturer’s add viscosity index improvers to artificially inflate this number (the higher this number is, the stronger your oil is). At times you will find other oils that have a number that is close to Amsoil’s, however once these oils are put under stress (heat) the viscosity index improvers that were used to inflate this number in the first place will burn off and of course now this oil will not protect your engine as well as Amsoil who achieves a higher viscosity index through a superior additive package designed to protect your engine for the long haul.
The Flash Point is the temperature at which an oil will flash if a flame were put to it at a certain temperature so obviously the higher this number the better. This means superior oils such as Amsoil keep on protecting your engine in the most severe conditions.
The NOACK test is measured as a percent so in this case the lower percent is optimal.
The total base number is essentially the strength of your oil and the higher the number the better. No matter what brand of oil you are using the total base number will decline over time. So as an example lets say that once an oils total base number reaches 2 or 3 its time to change the oil. Now which oil will get to a 2 or 3 first if both vehicles are being operated in similar conditions an oil that starts with a base number of 12 or one that starts at 8? This is the main reason why Amsoil can extend their drain intervals, we have higher Total Base Numbers.
Now that you have the basics down on how to compare diesel oils I have included a couple of Typical Technical Properties Data sheets for you to look through. If you are trying to compare diesel oils or any kind of oil for that matter just go to google and type in (as an example) “Shell Rotella diesel oil data sheet”. You can now compare any kind of oil you want to without even buying any. Most of the forums out there don’t talk about this technical stuff and basically all everyone recommends is simply the oil they are using with nothing to back it up.
Now here comes my two cents worth. Which oil would I recommend? Compare for yourself and you will see Amsoil clearly wins every comparison on paper so why not start there. I’ve used Shell, Valvoline and Castrol before and Amsoil simple killed all three of those oils on both drain intervals and increased fuel mileage. Where can you go and put Amsoil in a 7.0 Liter Ford F-250 then jump from 16 mpg to 18.5 mpg? No other oil I’ve tried has increased my fuel mileage, never!
I just don’t sell Amsoil, my goal is to make sure you understand what you’re buying and why Amsoil will outperform any other product on the market. Get in touch with me and we can go over the particular applications for your diesel equipment. You can reach me at 614-777-4550 or use my contact page on this site.