5W40 dino or all Grp III (no PAO or ester)

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Shell Helix Ultra 5W-40 is a Group III+ based motor oil.

I don't know whether it contains any esters -- they are frequently used for additive solubility in synthetics, but even if does it won't have a lot.

I've read that the Petro-canada Duron 5W-40 is available in Australia -- this is a Group III based oil too.
 
Im curious as to why you don't want any PAO or any Ester in the oil?
 
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