This is 2 weeks https://de.oelcheck.com/ turnaround vs the better blackstone which is currently 6+ weeks.
Thanks. Sadly don’t speak german, and on mobile I can’t find english version.
There are a zillion oil analysis companies but as the linked thread I posted shows, they mostly use different methods, which is a bit useless for trend monitoring unless you use the same lab all the time. Also you want to use a firm which does aviation, not boat or truck engines.
In think in this situation, you want a firm which does whatever satisfies the CAA to get the aircraft back in the air, even if the company specialises in analysing olive oil.
Finding one you actually want to use can wait.
That one from USA from Peter looks good. I just need someone who do it in two weeks (or less), not two months. I just aks in my work, (Czech Airlines) we are doing oil analysis for turbine engines, if they can do it for piston engines too.
You can send the sample to the US by DHL. Cost 50-100, they will have it 2 days later, and report probably same day. They need about 50ml; they send you sample kits but in this case you won’t have that.
It is airmail which has always been a “dirt cheap service”, perhaps 5% chance of disappearing totally (100% if sending to China, Egypt, etc). Currently there are issues with airmail UK → EU but that’s another story…
The Czech CAA is demanding oil analysis??? That’s unbelievable. A one-off analysis doesn’t tell you much, unless the numbers are really terrible, but in any case the numbers will be ok if the oil was changed a few hours beforehand – a tactic used by some people selling their aircraft 
Well, I am finally happy, they will accept the engine, but with some inspections, oil analysis is one, borescope is second. I will do both, and they will leave me alone.
if they can do it for piston engines too
Of course they can, an oil analysis is just an oil analysis… but what they are lacking, is the huge experience and comparative database piston engine aviation lab provide.
Blackstone is probably the most comprehensive, sometimes too much for my liking… using AOA for quite a few years, and also perfectly happy with them.
You can order the free probes direct from Blackstone or use one of them here Aircraft Spruce
There a few providers in Europe, but none has near the volume US based labs have.
Well, thanks. I will write them and I may choose Blackstone. But now I must solve few issues and install the engine.
Well, guys, everything is behind me now. Airplane is now flying and airworthy, engine is running well. We added some things to maintenance program, some extended maintenance for outdated engine, but at all CAA was helpful and they were satisfied after test flight. Anyway thanks to all for their opinion and help in this thread.
