Seals and engine life?

Messages
2,338
Location
Charlotte Metro area
Seals usually eat fish and other sealife, so I don't think either of these oils will affect them. [Duh!] (I'm curious what the experts will say, too. Obviously, I'm no expert.)
 
Messages
702
Location
Ilinois
Is there any difference in the chemistry of a group 3 syn and a Group 4 or 5 that would make one better over the other. Is one easier on the seals or does one prevent consumption down the road? I am looking for any difference at all.
 
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