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Thread starter
There was a story behind the creation of 15W40.
I think it originated from truckers mixing
10W30 and SAE 50 together to obtain a shear-stable
multi-grade HTHS 4.4.
I was playing with SAE 20 and 15W40 on an ASTM
blending chart, and found that mixing the two
resulted in a blend that looked like 15W30.
The two engine oils were:
Duron 15W40
40C 118
100C 15.6
150C 4.3
Duron SAE 20
40C 65
100C 9.1
150C 2.7
Low/High
45/55%
I think it originated from truckers mixing
10W30 and SAE 50 together to obtain a shear-stable
multi-grade HTHS 4.4.
I was playing with SAE 20 and 15W40 on an ASTM
blending chart, and found that mixing the two
resulted in a blend that looked like 15W30.
The two engine oils were:
Duron 15W40
40C 118
100C 15.6
150C 4.3
Duron SAE 20
40C 65
100C 9.1
150C 2.7
Low/High
45/55%