Quote:
Originally Posted by Assimilator1
Yea all oil changes ideally, appreciate that the 1st one will show high metals etc.
Would like to see trends from the start (from new engine &/or new bearings).
One theory (for some S65s at least), is that the wear occurs early on in the engine's life (mainly thinking for OEM bearings). Hence I would like to see the whole history, but I appreciate that very few people will  . |
The first analysis after internal engine work (or a new engine) is basically a throw-away. Even the second one is only of marginal use to simply validate that most of those break-in contaminants have been removed by changing the oil & filter.
The whole point of a UOA is to establish a baseline and then monitor deviations from that.
Here's just an example. It's not an S65, it's a Chevy LT1 (Corvette/Camaro/truck motor). Same concepts apply though.