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Amsoil is very consistent in terms of results. M1 is also very consistent in term's of results. Redline is not as consistent as Amsoil or Mobil but they can be quite good, don't get me wrong. I was not happy with redline in my e30 LSD or MT.
The major differences are base oils and additives. SG was reformukated in 2010 and uses a bit more stable base oil and more modern EP and AW additives. Severe Gear does contain FM's.
Severe Gear can be had in 75W-110, as well as 75W-90 and 140. It better matches the old school 80W-90 viscosity as the API cut the 90 viscosity to its lower half of the range, which is why for a spec, so many have gone to 140 lubes.
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