My plane’s most recent oil sample was sent a couple weeks ago. Before that analysis was processed, we tore down the top of the motor to replace what we suspected were high-time, worn cylinders. My oil analysis on that last oil change arrived in my email today, and while you had no idea we were going to remove the cylinders, your analysis indicated abnormally high metals and you suspected cylinder scuffing in your summary. You were SPOT ON!  now have faith that this oil analysis is money well spent.

Wow, best news I’ve heard all year! Thanks!

You guys were totally right. I accidentally put down 0W40 when in reality this is a 0W/20.

I am amazed! You all are the best. Yup, you caught the fact that the pushrod tube gaskets were changed on both due to some leakage. Also, the front engine I had just replaced #3 and #5 cylinders after overhaul due to cracked valves. Thank you again and keep up the stellar work.

Wanted to thank you. I sent in for an oil analysis because I’d been having some overheating problems, yet did not see any obvious oil in the radiator or coolant on the dipstick. I was in year four of a five-year warranty and the report showed coolant in the engine oil. Also in the report was lead from babbit bearing degradation secondary to the coolant. Your oil report contributed to my receiving a new reman engine for my Jeep. You guys are bacon savers!

I really appreciate your personable replies attached to my reports. Puts results in perfectly understandable form. This transmission is the most difficult to drive without using the clutch that I’ve ever had. Truck is quiet so one doesn’t hear the engine. Thanks.

Just want to thank you. After I received my last terrible report I tore down the top end of the engine and found both pistons had seized in the cylinders at some point between oil changes. I believe this report saved me a ton of money. The bottom end of the engine was fine but without knowing this was happening, I would have destroyed the crankshaft and related components. Again, thank you.

Have I thanked you recently for the service you provide? Well, let me thank you now: you folks are great , and a comfort to those of us who trust our lives to our aircraft engines.

Wow – you still had on file the results of my skid steer’s sample from 2003?! I am impressed and grateful. Thanks! I will change the oil as you suggest.

Many thanks for the oil analysis. You were right about the spike in silicon! Yes, the poor air filter had suffered a backfire during the engine start. The backfire evidently occurred since the last oil change. The heat warped the air filter, allowing dirt in and depositing goo in the air duct. We just got a new air filter and cleaned up the air duct during annual inspection. I’m not sure what I did to cause the backfire. First time in 30 years of owning the plane that I’ve done that. Anyway, thanks again – your detective work was spot on! Love your newsletters and archive articles. Have a great holiday season!