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We don't really have a problem with seals. Seal swelling additives are used in the industry but as with any additives, they come at a price, usually a compromise with performance. This car isn't old enough for those to be a factor.

The 1.4T requires a synthetic oil for longevity. Don't even bother looking at semi-synthetic options with how cheap some of the lower grade group 3 synthetics have become.

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Any time I have put synthetic in an older motor its caused leaks so do not want to go there.
This is not an old engine. You need synthetics in order to keep the turbo from eating itself in the long term, and with GM's gen2 dexos1 spec, all GM vehicles will be filled with synthetic if serviced at a dealer. The days of conventional oil are done. If your engine has leaks, replace the gaskets/seals causing those leaks. Deposits that old oils left behind to keep seals from leaking will also stick to modern low-tension piston rings, causing the vehicle to burn oil, and will also destroy turbos in short order.
 
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