Where to do oil analysis

I've heard Polaris is good, also blackstone.

I use finning for mine

 

Blackstone Laboratories | Oil Analysis - Learn What's Going On In Your Engine

 

I use Caterpillar . They have their own labs for all the heavy equipment they handle.

 

I use my local Caterpillar dealer, their SOS fluid analysis service. The kit SOS-1 is about $16 which includes a prepaid shipping label. Also, I'd buy their extraction tool, SOS-PUMP if you don't have a port, very nice as the design is such that the oil does not come into contact with anything other than the bottle and the tubing that goes down the dipstick, it's about $27 and well made in a case. Best price I've found.

I have a 2015 Volvo D13 780 with about 850k

SOS Fluid Analysis for Caterpillar Machinery | Peterson Cat