oil grade

[rocket0000]

hi guys just an advice on oil grades. i got a vx v6 145000km on the clock and using engine armour 10w30. car runs perfect no problems. one day i decided to try dura bland semi 10w40 and the oil is really great but the fuel econemy went bad i noticed that am using more fuel then ever.
some ppl say that after 100000km 10w40 or 15w40 is more recommened .
any advice plz.???

[Brett_jjj]

In my VS ecotec I use penrite HPR 15, which is a semi synthetic 15W - 60 oil. This oil stays a bit thicker than the 20W - 50 oil at highter temperatures for better protection in the hot aussie summers.Its also a bit thinner at cold startup than the recommended 20W - 50 oil,so the oil flows up into the engine easier and quicker when its first started from cold.Around 90% of engine wear occurs at cold startup.I change my oil and filter every 5000 k's.My engine has done 150,000 km now.