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Originally Posted By: kschachn What matters most is what required specifications does your owner's manual give for the oil? Thank's for your answer My owner manuals says 10w40 and 5w40 is okay. But i remember that my engine worked better with semi synthetic and my engine using less oil with...

Originally Posted By: mbacfp Hello All, Hope everyone is well. I wanted to get some guidance regarding two of my vehicles OCIs. 1. Mazda CX-9 – Mazda recommends conventional – 6 months or 7,500. I am running synthetic 5w-20 and plan to do 1 year or 6,000. Sump is 5.5 qts. Don’t consider severe...

Hello and have a good time I'm a new user and this is my first question I am using castrol edge 5w40 in my car and my car is burning little bit oil. In old days i've using total 7000 10w40 semi synthetic and i remember when i switched to total 9000 5w40 full synthetic i saw my engine oil...