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Yeah Penrite do the Enviro+ 10w40 CK-4, just never been a fan of the Penrite stuff https://penriteoil.com.au/products/enviro-10w-40-full-syn

Good to know, thank you mate. Unfortunately oil is NOT that cheap down here in Aus haha, the Mobil 1 ESP is around $107Aud for 5ltr.... Castrol LL the same. The Fuchs cost me $102/5ltr earlier, so is actually cheaper. And with a 7lt change it sucks having to buy 10ltr, as they sting around...

That's i guess why i was leaning towards the C3 side of things, as it is obviously there in the list, and most appear to be lower ash content anyway than any of the HDEO's they list, more over with a lot of shorter trips or suburban driving, i feel like a 10w or 15w is a bit on the high side...

It's a very popular segment down here, i believe the highest selling cars in Aus; Ford Ranger, Toyota Hilux, Isuzu D-Max, Mazda BT-50, VW Amarok etc. The US trucks are gaining in popularity nowadays, but the prices here are outrageous, and so is diesel, and we don't really have infrastructure...

Thanks all! Appreciate the input. I probably should have added some detail regarding expected driving use; it is purely a commuter, i don't do any offroad/hard towing etc. so my thinking towards other oil options was based more on that than needing a HD oil unless the engine specifically wants...

Hi all, Recently purchased 2026 Isuzu D-max with the 4JJ3 diesel, previously had 2017 Nissan Navara running the 23DTT and used Castrol 5w30LL for the 40,000km of ownership since new in between OEM servicing, with great results and 5,000km max change intervals. Was always very smooth and quiet...