Formula Shell oil, how good is this oil?

[Baveux]

quote:

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Originally posted by Johnny:
Actually I would put them in 4 tiers.

Upper tier:
Pennzoil & Quaker State (both Group II+ all weights)

Middle tier:
Formula Shell (Group II & Shell ad pac all weights)

Lower tier:
Wolf's Head (Group II on 5W/20/30 & 10W30 only & std ad pac)

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Johnny , what is the main difference between the Pennzoil and Shell ad-pack