UAL Bagsmasher From United States of America, joined Sep 1999, 2151 posts, RR: 9 Posted (11 years 3 months 2 weeks 2 days ago) and read 5842 times:
I have a 2001 Honda Civic. The book calls for 5W-20 oil to be used year round, which I have been using. Recently I came across an article that claims the only reason Honda switched its engines from 5W-30 to 5W-20 was for fuel economy. The 5W-20 supposedly shortens engine life. My question is if I switch to 5W-30 in the summer, will I harm my engine? I don't care about 1-2 mpg loss in mileage. I want my engine to last. Also, is it permissible to mix 5W-20 with 5W-30? Thanks.
L-188 From United States of America, joined Jul 1999, 30129 posts, RR: 58
Reply 1, posted (11 years 3 months 2 weeks 2 days ago) and read 5841 times:
Your owners manual should have a chart that shows a number of different oils that can be used for different conditions.
I still haven't seen a whole lot of 5W-20 reach store shelves. I have the exact same motor in my truck as my brother does in his, both are F-150's. His is 5 years older and used 5-30 mine goes for 5-20.
OBAMA-WORST PRESIDENT EVER....Even SKOORB would be better.
DesertJets From United States of America, joined Feb 2000, 7856 posts, RR: 14
Reply 4, posted (11 years 3 months 2 weeks 2 days ago) and read 5828 times:
I'd be willing to accept what your owner's manual says. Honda certainly did warm weather testing with that engine and car with the 5W-20. So it should be fine in the warm summer weather.
I might also suggest finding a Honda enthusiast website, I am sure there are millions of them, and try poking around there for an answer. Somebody probably knows for sure. But somehow using 5W-30 or 10W-30 will likely not kill your car.
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