Ask an expert
![Laki05](themes/aaAle/images/interface/profile-pic-placeholder.47cf740a.png)
I have bought recently Mazda Premacy 2.0 , imported from Japan. My question is related to the choice of the appropriate engine oil. People from service nearby have said that genuine oil 5-W30 could be replaced with 10-W40 without any negative effects. What is correct?
![Anon](/assets/aa/aa-avatar.png?m=1466990309)
If the manufacture recommends using a 5-w30 oil I would try and stick to their recommendations. Its unlikely to cause any major issues however the cost difference between these oil grades is relatively low.