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Hello guys, so recently i was deciding to change my oil from 5w40 to 5w30. Been using 5w40 fully synthetic since the beginning because i live in an area that gets very hot. Since it’s been getting cooler, i wanted to try the manual recommendation which is 5w30.
I went to a shop and they changed the oil. The oil used was castrol magnatec 5w30. However after the oil service i realized the oil was not fully synthetic as it had only “with synthetic technology” written on it. This means it’s a blend but not fully synthetic.
Will this cause any decrease in performance and mpg? Should i change the oil again or keep it for a while? It’s good for 10,000 km.
 
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