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Yachting Magazine Test - The Raw Data


ITHOUT A DOUBT the best way to assess the condition of an engine is to tear it down. But almost as good a tool for diagnosis is spectrochemical analysis, or oil analysis. Since different parts of an engine are made from different metals, the presence of these particles in the oil can be an indicator of increased wear.
The chart below shows the raw data of oil samples from the Yachting Magazine study. The top half represents the samples taken from the starboard engine using petroleum; the bottom half reflects samples taken from the port engine which used AMSOIL products.
Each green-shaded row represents an oil change. Both engines were run on petroleum for 100 hours just prior to the test to compare their wear patterns (Sample 1), which are fairly similar.
Symbols: Fe (iron), Pb (lead, from leaded gas), Cu (copper), Cr (chromium), Al (aluminum), Ni (nickel), Ag (silver), Sn (tin), Mo (molybdenum), Cd (cadmium), Sb (antimony), PC TS (% of total solids).

#
ENG
ENG HRS
OIL HRS
Fe
Pb
Cu
Cr
Al
Ni
Ag
Sn
Mo
Cd
Sb
PC TS
1
S
478
100
478
998
10
11
18
1
0
0
4
0
0
3.5
2
S
478
0
478
0
0
0
0
0
0
0
0
0
0
0.5
3
S
506
28
506
998
7
11
23
1
0.1
0
3
0
0
3.5
4
S
554
76
554
998
9
15
32
0
0.3
6
5
0
0
2.0
5
S
570
92
570
998
14
20
39
2
0.3
15
10
2
2
3.0
6
S
596
118
596
998
17
20
37
0
0.6
15
10
1
1
2.5
7
S
652
56
652
998
110
10
22
1
0
3
6
0
0
2.0
7B
S
653
57
653
998
107
10
21
1
0
4
5
0
0
1.0
8
S
665
69
665
998
103
16
41
1
0
6
6
1
1
2.0
9
S
720
55
720
998
59
15
32
1
0.1
10
10
2
2
0.5
10
S
820
155
820
998
40
14
26
2
0.2
12
10
3
3
2.5
11
S
861
196
861
998
59
17
32
2
0.2
13
14
5
5
2.0
12
S
860
215
860
998
74
16
28
2
0.2
12
12
5
5
3.0
#
ENG
ENG HRS
OIL HRS
Fe
Pb
Cu
Cr
Al
Ni
Ag
Sn
Mo
Cd
Sb
PC TS
1
P
478
100
255
998
10
25
39
2
0
9
8
1
18
1.5
2
P
478
0
3
1
0
0
0
0
0
0
0
0
0
0.1
3
P
506
28
51
998
3
3
5
0
0.1
1
3
1
14
0.2
4
P
554
76
87
998
9
7
5
0
0.9
4
3
2
8
0.5
5
P
570
92
80
998
10
7
6
0
0.3
4
3
3
10
1.0
6
P
596
118
96
998
11
7
9
0
0.2
4
3
3
15
1.0
7
P
652
174
166
998
11
12
24
0
0
8
8
4
9
1.5
8
P
665
187
138
998
12
11
23
0
0
1
4
3
9
2.0
9
P
720
55
77
998
11
5
8
0
0.2
3
5
4
6
0.5
10
P
820
155
104
998
10
6
7
0
0.1
4
5
7
3
1.5
11
P
861
196
124
998
15
6
6
0
0.1
2
7
9
5
1.0
12
P
880
215
144
998
 16
7
8
0
0.2
2
7
10
14
1.0

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