Mercruiser 25w40 in Merc Racing HP525

[JimG]

Got the Blackstone report back on this oil. Very impressive!

Mercury Racing HP525 2005 Sonic 42SS

Oil Mercruiser 25w40
Oil added none
Hours on oil 21
Hours on unit 84 approx
Date 8/25/05

Aluminum 6 5 Universal average is second number
Chromium 2 2
Iron 10 63
Copper 71 19 (lingering wear-in of bronze parts)
Lead 2 7
Tin 0 9
Moly 4 17
Nickel 0 1
Manganese 0 3
Silver 0 0
Titanium 0 0
Potassium 122 12 possible antifreeze issue
Boron 104 81
Silicon 26 115
Sodium 7 14
Calcium 564 519
Magnesium 1249 1195
Phosphorous 1243 1033
Zinc 1457 1280
Barium 0 0

SUS Vis@210C 70.9 70-85 Sheared to high 40, not bad
Flashpoint F 370 420
Fuel 2.5% Antifreeze ***
Water 0 0
Insolubles 0.3 TBN 8.3 Plenty of active additive left, could've continued to run this oil according to Blackstone.

I'm pretty impressed with this oil. The additive pack is VERY strong after 21 hrs, much stronger than the Kendall I've been using and stronger than virgin M1-EP. And didn't even shear out of grade. It's the strongest dino oil I've seen, that's for sure. I guess those guys at Mercruiser know what they are doing?

 

[JonS]

Which boat was this in? I thought you were going for the straight 40w? Does this boat have raw water cooling with a 160 thermostat?
I have seen the Quicksilver synthetic blend 25w-40 for $3.99/qrt.

 

[Schmoe]

Pretty dang good UOA, period. Surprized Merc. has something that good, too bad it costs so much. I for one would like to see more moly in it though. Boron just hasn't been around long enough for me to jump ship.

 

[JimG]

This oil costs $2.33 at our local Academy. Walmart is carrying it now also, same price.

 

[JimG]

No, this is not my boat. It belong to my friend, Bill. It is a 2005 Sonic 42 with twin Mercury Racing HP525EFI's. If any of you saw the Smokin' the Sound race this year in Biloxi (sniff), it was the pace boat.

After seeing this UOA, I may switch...