Oil consumption in QG18DE

Have a N16 with QG18DE that is drinking oil, looking in the cylinders when removing spark plugs I can see 3 of the 4 cylinders are wet with oil, car has done 146km and doesn't appear to smoke but can use 1L in 500km.

It's not worth rebuilding the engine so looking to manage the problem until it dies, any one tried using thicker oils to at least reduce oil loss, if so what grades, a mechanic recommended 40w 70, I was thinking 20w 40.

Cheers
 
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