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Can I substitute 10w-30 for 5w-20 in a mazda3?
I own a 2007 Mazda3. Mazda recommends I use 5w-20 oil in it. Recently I found a bunch of Mobile1 10w-30 when cleaning out my garage. What I want to know is if it would be unwise to use it in my car. Obviously I should stick to the manufacturer recommendations, but I figure I have it, I might as well not let it go to waste.
For the record, I'm not a total cheapskate. I'm fine with buying the correct oil if I need to. But I figure if I can use what I have, why not.
Btw, the car has high mileage on it, over 110,000 miles. Also, I live in Hawaii, so cold weather performance isn't exactly an issue.
2 Answers
- 8 years agoFavorite Answer
10 30 should be listed on the approved oils in the owners manual but it will have an effect on the gas mileage.
- 8 years ago
Should be absolutely no issues especially since you live in a consistently warm environment. A lot of people switch to a heavier oil in the summer months anyway. And its Mobile 1, one of the better oils on the market so extra bonus!
Source(s): Mechanic
