Hello, I wanted to tell you about my 1973 searay you did an analysis on. I had the engine replaced.  When I had some time I took apart the block and found cylinder 4 had one 2 inch vertical crack on the cylinder wall.  It was an open system so I could not see any water missing. I did notice the oil looking like milk chocolate however the lab did not show much water in the oil. Anyway all the other measurements were way too high. Just thought I would update you on my findings. Thanks for your services.

Thanks for your quick response. It’s nice to know that the engine is one less thing to worry about.

I’m loving the confidence that doing the oil analysis gives that I’m not changing oil too soon.  I put a lot of money down the drain in the past. Thank you for the help! 

Thank you so much for the prompt response. I don’t use the vessel as much as I would like but I will continue to send in samples each year regardless. I’ll send another sample just before I lay it up for the winter, sometime in November. Thanks again and I look forward to working with your team. I will recommend your service to friends who I KNOW have never had their engine oil analyzed. Cheers

This is great. I have been suspecting fuel for a while now. I might consider changing the fuel pressure regulator and getting new injectors and probably swap in a new o2 at that point.

Blackstone team, I just wanted to say thank you for offering this service (and for offering it at a reasonable price!). I feel like my kid received good grades on his report card. I will be sending you another sample next summer. Thanks again

I’ve been sending you samples for five years. This report was the first one that spotted trouble. Sure enough, your diagnosis was spot on! It was a leaky intake gasket that was the most likely culprit, also causing the engine trouble light to come on. It seems the problem’s been cured. Should I change the oil again and send another sample after 2000 miles? How about using a synthetic? Again, great work guys.

Had to overhaul my 06 Columbia Freightliner. Thank goodness I took a one year warranty on it! Your samples provided the needed information that something was wrong with the motor. Had a leaking head gasket and two or three of the cylinder liners were leaking as well. Thanks for the good work.