Hey guys, I recently was calling up the hotline for Pennzoil to ask if they sell 15W40 in Canada. Strangly it went straight to a Shell Oil number. I knew they owned Quaker State but Penzzoil aswell? So what this leaves me wondering and I wish you could answer my question;
is Q.S., pennzoil, and Shell oil all the same formula??? They are owned by the same parent company so I wonder if the formula is still the same, and if we can just choose between whatever is on sale. Shell is usually sold cheaply at Costco stores....So are they all the same?

Thanks.

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