I cannot praise enough the invaluable information provided by BLACKSTONE Lab in each and every oil analyses performed. I have discussed this with you on multiple occasions re: my Jasper replacement on my 01 Grand Cherokee 4.0L. A Jasper installed Feb 2022 with 152k and as of 3/13/24 under 30k on this reman 4.0. I have meticulously changed the oil and sent samples to BLACKSTONE with each and every oil change, except the first 500 miles. Low oil pressures from the onset and then progressive antifreeze and metallic particulate(s) contamination demonstrated with with each sample- and great narratives with each report.
Jasper Warranty Div has everything and will soon swap out this failing eng to another 4.0. I just sent another sample 3/13 and await the analysis. And for the first time ever, a few days ago, I found mayonnaise on my oil filler cap – none in the radiator, dipstick nor the overflow tank, and never an external leak.
THANK YOU MUCHLY- it has been worth every dollar I spent!!
