Hi Stinky,
no, no additive issues, we closely monitored the oil's condition (Del 1) over many UOAs prior to deciding on an OCI for all engines
I reported here on another thread that one engine was pulled apart for an "inspect & measure" at 1m kms (620k miles). The engine was amazingly clean everywhere
All parts measued up by the engine's maker as "suitable for reuse" - including the troublesome pistons in this particular engine series
All bearings were as new (the cam bearings were simply rotated), the camshaft and rollers/pins were as new too. All of the liners still had original finish marks over their whole wear surface length
At my insistance new rod bearings and rings were installed and then bedded in via a dyno sequence after 3k kms road use
An important part of the installation of a centrifuge is to ensure that the oil pump has plenty of surplus flow at all times. The centrifuge flows oil when cold too (unlike TP/cartridge types etc). The twin jet drive chamber runs at speeds up to 6000rpm and is audible in action - as soon as the engine cranks over - this serves as a good quick service check!
Because of the way Del 1 handles soot we could have gone much further with OCIs. My conservatism based on the DD limit of 3% amd Mobil's 3.5% I settled on 3.5%. I had been told by "certain people in the know" that 6% is acceptable with this oil. After the "tear down" result I believe this is so
Regards
Doug
[ April 20, 2005, 11:03 PM: Message edited by: Doug Hillary ]