“Mr. Charley Sims, 

I thank you for the prompt delivery on my new By-pass oil filter. Also I want to let you know that I am very satisfied with your filter performance and dollar savings performance wise. 

I run a 1693TA 425 Cat Engine. I use a 15W 40W oil, for the past ten years until our phone conversation in March 1990. I had changed oil on a 10,000 mile interval with one change on the GCF filter …. As per our conversation I’m not going to change oil, I will change main filter at 50,000 miles by-pass filter 3,000-4,000 miles and take oil sample…. 

Dollar wise: 

Changing oil the way I have for the past ten years I know I’ve saved no less than $4,050.00. This is based on 90 oil changes in 900,000 miles at $90.00 per change using twelve gallons of oil, one cat filter, one luber finer filter which you deleted. 

One in-frame was done at 490,000 miles; all bearings looked good and new, rings were not gummed up…. In fact, it was the cleanest engine I have ever seen inside, all replacement parts were standard…. 

Charley, thanks a million for the service….” 

Ira Rogers