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What brand oil is the best to use in a Honda 2000 ek3??

 
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Any name brand oil will be fine.
I usually grab whatever is on sale.
Don't use the super cheap no name oil

 
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The best oils are only needed for high horse power engines to control burning due to extreme temperature swings and ranges.

But in no particular order (the synthetic versions of)

-Mobil 1
-Pennzoil
-Total
-Redline
-Castrol

Really though any oil which is API approved will do, even the lessor brands.

 
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I've put in Valvoline "high mileage" oil, Quaker State, Pennzoil, even Walmart's former brand Tech2000 (I think that's what it was called) (all conventional 5W30), never noticed any difference, so I just put in whatever I can get on sale.

I would only go for synthetic if as above you have high hp (especially turbocharged) engine and/or live in extremely cold or hot climate

 
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Whatever is on sale. Amazon Basics oil is suppose to be a great deal and on par with the more basic Mobile One synthetic's.

I use Redline in my GTI but that is way overkill for older gen Civic.