Originally Posted By: BikeWhisperer
Originally Posted By: wemay
Havoline HM, Pennzoil bronze bottle HM, SuperTech, Mobil HM etc. are all listed as conventionals.
*I know Pennzoil has recently released a blend or synthetic HM.
M1 HM syn
Maxlife syn
Maxlife blnd
Castrol HM blnd
Defy blnd
Again, there have been multiple articles that mention that all High Mileage oils have some synthetic in them as part of the additive package. Here is one example
http://www.ehow.com/about_6113608_high-different-regular-motor-oil_.html
Concerning Mobil Super High Mileage, this chart is pretty clearly calling it a blend.
That is my point concerning MSHM, when you call Mobil, they advise its a conventional.
Also, from their website...
Mobil Super High Mileage
premium conventional oils offer outstanding wear protection under a wide variety of operating conditions, and they have been proven to fight sludge and help reduce wear.
https://mobiloil.com/en/motor-oils/mobil-super/mobil-super-high-mileage
The specs also point to this being a conventional.