which synthetic oil do you prefer??

IDZRVIT

When I was in the navy I had the opportunity to work in the lab where oil analysis was done and performed the actual analysis. At that time it was called SOAP - Spectrographic Oil Analysis Program. Similar elements were measured as in the UOA. It wasn't measured by percentage but rather in ppm. Samples of the oil were filtered and mixed with a solution in test tubes (can't remember exactly as it was twenty years back) and analyzed in the spectrographic apparatus. This was done routinely on a monthly basis for the engines, gearboxes, pumps, etc. Everyone should be aware that molecules in the components such as lead in journal bearings leech out into the oil from the constant contact between the two. So there was always a reading. From trending and comparison of results from sister ships with identical propulsion systems conclusions were drawn as to whether there was actual wear or just 'leeching'. Wear was normally identified by a spike in the ppm. VA (vibration analysis) was recommended to ship's staff to perform on the suspect bearing. Anyway, for you guys that get UOA's, pay close attention to the results. You don't have the luxury of doing VA and you don't want to be tearing down your engine looking for the bearing that may have resulted in a spike in the UOA report that may have some wear but not worn anywhere near the point of catastrophic failure. I will say this - changing the oil will not repair a worn part! However, after changing the oil and reviewing the UOA results, it may confirm a wear condition if there is another spike or if there isn't a recurring spike, then the original analysis may have been an anomaly - nothing is 100% perfect.

__________________
"America.... still builds rockets!"
Vette: 355 cid, 400 rwhp
'13 CTS-V Coupe: 6.2L LSA, 556HP