According to this data, there seems little doubt that Exxon Mobil began blending their 5W30, 10W30, and 15W50 formulas with a good dose of group III base stocks. As I know that the base stock composition of their 15W50 product remained unchanged from the SH to the SJ transition, this practice probably began with the SL formulations after Mobil lost its complaint against Castrol and after the Exxon/Mobil corporate merger, both occurring in 1999.
From a performance standpoint, this makes little difference in virtually all applications of said products -- just a question of corporate integrity, which may seem like an oxymoron when speaking of oil companies (not just EM, but all of them).
SJ--------------------- 0W30- 5W30- 10W30- 15W50
Pour Point C----------- -54---- -54---- -54---- -48
Flash Point C -D92----- 238---- 235---- 243-- 245
cSt at 40C------------- 52----- 53----- 59----- 120
cSt at 100C------------ 9.7---- 9.9---- 10.0--- 18.0
Viscosity Index-------- 175---- 176---- 157---- 168
SM--------------------- 0W30- 5W30- 10W30- 15W50
Pour Point C----------- -54---- -48---- -45---- -39
Flash Point C -D92----- 228---- 230---- 224---- 235
cSt at 40C------------- 63.1--- 11.3--- 62.0--- 131.2
cSt at 100C------------ 11.0--- 64.8--- 10.0--- 18.1
Viscosity Index-------- 169---- 169---- 147---- 154
Found an old product data sheet for Mobil 1
- Thread starter SubieHo
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How on earth can you determine that 'there is little doubt they started using Group III base stocks' from this data? Are you just basing it on the now-higher pour points? I don't think you can make that conclusion - the numbers are too close to be a definitive answer...
Funny how their 0W-30 and 5W-30 products used to be a lot thinner.
Sorry guys -- posted this in the wrong forum.
"TriSyn: 8x better than SuperSyn"... oh wait! 
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