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PostPosted: Mon Oct 05, 2015 6:36 pm 
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Joined: Thu Jun 29, 2006 10:26 pm
Posts: 5612
Location: Long Island NY
Well finally I did another oil analysis on my old '88 with Blackstone Labs. I wanted to see if the Merc 25/40 oil was worth the extra price over straight weights that used to be the recommended oil for these engines. What I found out, was it is worth it and performed even better than the straight 40 Chevron Delo 400 I had been using before.
My first analysis was done back in 2011 and then, the SUS Vis @ 210 F for the Delo 40 was 67.0 which equates to the top of the 30 weight range, the cSt Vis @100 C was 12.16 which again is the upper limit of the 30 weight range.

The second one (now keep in mind I had a bad overheat 2 seasons ago in 2013) with the plain Merc 25/40 (not the syn blend version) was:
SUS Vis @ 210 F : 81.1
cSt Vis @ 100 C : 15.79
Both are at the upper end of the 40 weight range.
So the Merc oil definitely holds viscosity vs a straight weight and is for sure a better choice than any of the automotive grade multi vis oils.
TBN was 6.6
Znc was 960
Phosphorus was 814
These last 2 were the only measurements that were higher for the Delo 40, which had 1705 for Zn and 1418 for Phos but that was before the diesel oils were lowered in this regard.

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88 Four Winns 200 Horizon
4.3 OMC Cobra-4bbl
2002 Walker Bay 10/2012 Suzuki 2.5
2008 Walker Bay 8

1998 Jeep Grand Cherokee 4.0/Selectrac
2007 Jeep Grand Cherokee 5.7 Hemi/Quadradrive II


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PostPosted: Tue Oct 06, 2015 6:56 am 
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Joined: Fri Jul 27, 2012 11:17 pm
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Location: Melbourne, Australia
Nice work, LouC.
What % of viscosity drop did you experience from a brand new sample to the tested sample?
Scan & post the analysis report, please! :wink:

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2011 Four Winns H180 SS.
Aussie built Mustang 2800.
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