This letter is a summary of a letter received from the President of Interstate Battery of Detroit.

I am writing to let you know how pleased I am with the AMSOIL program that you helped set us up with. For the past 25 years our fleet of trucks, mostly Navistar/International 4600 Series trucks, have been using regular petroleum-base lubrication products. We thought that we were happy with our lubrication program until we were introduced to AMSOIL.

I was very reluctant to switch from regular lubricants to fully synthetic lubricants because the benefits of AMSOIL seemed too good to be true. To be honest, when I was told that the motor oil could go as long as 100,000+ miles without changing, I didn't believe it. I can tell you now I am a true believer.

We have been using AMSOIL now for about 4 years and have changed the entire fleet to AMSOIL synthetic lubricants. We use the By-Pass oil filtration system on all of our trucks with the Synthetic Heavy Duty Diesel and Marine 15W-40 oil. We use AMSOIL grease and use the 75W-90 gear lube for the manual transmissions and differentials and the synthetic ATF transmission fluid for the automatics.

What do I get out of using AMSOIL? A lot! After becoming fully synthetic on all of my trucks, I picked up an average of 5% in fuel savings. I haven't had to change my oil since I switched...4 years ago! I can't tell you how much money that has saved me in time alone. I have several trucks with over 100,000 miles on the oil and I am still getting high marks when I send the oil in for analysis But the best benefit is the decreased wear and tear on my equipment such as the pistons, cylinder heads and walls, transmission gears and differential gears. That is the most important to me because it means I can leverage my fleet longer, which translates into saved dollars. It means I can put those extra dollars to work in another area of my business. My average truck life has gone from 7 years to more than 15 years! UNBELIEVABLE! I have estimated the savings from better leverage alone will save me over $20,000 per year.

Thanks for all the help as I've implemented this new program. I am absolutely ecstatic about the results so far and I look forward to a long and fruitful partnership with you and AMSOIL.