This is my first UOA, (hope I did everything right!) This engine is in my Thoroughbred offshore performance boat. It's a 509ci, Chevy/Mercruiser block, all forged internals, Merlin VR heads, Ultradyne 306/296 cam, Brodix intake, CMI headers. It's raw water cooled, (salt). Never dynoed, but should be 550-600hp@5600rpm. I use 20 hour OCI and M1-302 filter. This new-style Kendall, not green...
I usually run between 3500-5500rpm. Blackstone mistakenly thought I ran leaded gas, that's the reason for the high average.
JIM: The sodium in your oil is either coming from antifreeze or sea water, depending on how this
engine is cooled. In either case, it probably should not be there, but at least it doesn't appear to be
hurting anything. Most wear was lower than average, and the above-average copper is a result of
lingering wear-in at bronze parts. It should improve with time. The 1.0% fuel isn't a problem at this
level. The TBN read 7.2, still lots of active additive left. Check back in 20-30 hours. Hopefully sodium will drop.
509 Marine Engine NA
Oil Kendall 20w50
Oil added 1 qt
Hours on oil 20
Hours on unit 200 approx
Date 7/20/2005
Aluminum 2 6 (Universal average is second number)
Chromium 1 2
Iron 17 22
Copper 53 39
Lead 6 186
Tin 1 2
Moly 67 31
Nickel 0 0
Manganese 0 4
Silver 0 0
Titanium 0 0
Potassium 2 1
Boron 11 40
Silicon 7 13
Sodium 56 1`6
Calcium 1941 1171
Magnesium 37 686
Phosphorous 851 791
Zinc 1016 928
Barium 0 1
SUS Vis@210C 77.4 82-95
Flashpoint F 365 385
Fuel 1% Antifreeze 0 0
Water 0 0
Insolubles 0.2 <.06
