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Old 23 Nov 2009, 09:46 am
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Default 2006 honda civic SI 5w30 oil vs 5w20 car experts only?

i own a 2006 honda civic si. i put amsoil dominator 5w20 oil in for my last oil change, but im considering switching that out due to it may or may not harm my engine if i put it under stress. the recommended oil to use is 5w30. i have heard that 5w20 oil will give better gas mileage and more hp, which is so far true because the butt dyno says that theres a little more power. anyway, what should i do, should i switch out to 5w30 to be safe or would i be alright with the 5w20. keep in mind my redline is 8400 rpms and i do track the car every once in a while. please know a thing or two about cars before posting an answer, i would like some facts not opinions.
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Old 23 Nov 2009, 10:01 am
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http://www.machinerylubrication.com/...articleid=518.















http://www.aa1car.com/library/oil_viscosity.htm































that will help you friend you need too understand your weather conditions will demand a oil for cold startups and yes you are looking for something that will keep viscosity with higher temperatures
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Old 23 Nov 2009, 10:16 am
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depends where you live, in the north a 5-30 oil would be Ok although I would use a 0-40 fully synthetic oil for all hondas under a few years old, in the sunbelt I would use a 5-40 or 0-40 or 5-50 fully synthetic oil year round the difference in power between 5-20 and 5-30 is non existent, 5-20 is too thin for an oil in an engine that revs to 8400 when at operating temperature, you need to compare shear characteristics and that is just getting silly
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Old 23 Nov 2009, 10:31 am
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put more stickers on your car it will make it go twice as fast!!! Research shows Imports always gain massive torque and HP with more stickers!!! Use laundry detergent in ur engine
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Old 23 Nov 2009, 10:46 am
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The oil recommended is the one to use. Tight clearance motors generally require lower viscosity to reduce heat from fluid friction. I know a person who bought a volkswagen several years ago. It was new and the engine wore out in a month. The dealership had put 5w30 in it and the recommendation was 5w20. Using too heavy a viscosity in a tight clearance engine will cause damage just like using too light a viscosity. If you put 5w20 you may not have sufficient film strength to keep the metal parts separated when the engine is hot. This will cause acellerated wear. If you are willing to trade engine life for extrahorsepower and slightly better mileage, go for it. Very few things are free, and they usually come at a cost.
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Old 23 Nov 2009, 11:01 am
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Use the 5 w 30 until it to cold and is in the 5 w 20 range. The 5 w 20 will not protect as well as the 5 w 30 when hot.































Plus you yourself said the heavier oil is preffered by Honda, and the cars is negineered to run best off of it.
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Old 23 Nov 2009, 11:16 am
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Honda recommends 5W20 for all cars, the only oil thats different is the one for Honda hybrids and its still 5w20
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Old 23 Nov 2009, 11:31 am
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5W20 is the recommended oil viscosity for your Honda. If it was my car I would run Mobil 1 5W20 synthetic. That's all I run in my 2008 Honda Accord.
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Old 23 Nov 2009, 11:46 am
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The differences in viscosity of oil is low when you compare those too. so there is no inherent worry of you damaging your car. Hondas are strong engines, especially B16,B18, and K20s like yours. plus your ecu can be re flashed and the red line increased. my NA 2001 Integra B16 reds at 9k and can go up to 10k safely.
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Old 23 Nov 2009, 12:01 pm
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All 20 is is less viscous so it flows easier in cold weather, you probbly wont experiance engine damage, but if you do want more power but still keeping 5w-30 i would suggest you switch to sythetic.
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