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Old 06 Nov 2011, 08:46 pm
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Default What oil weight should I use for a 03 civic si with 165,000 miles?

I have a civic si hatch with k20a3 motor with 165k in odo. I want to do oil change but Im still not sure of the weight of the oil that I should use, 5w30 or 10w-30 thats what everybody recommends but i did oil research and 0w-30 is the one with more viscosity out of the 3, and i know that more viscosity in the oil is good for the engine, but i have 165k in my engine and i dont know if thats any good. My oil level was low when I got it so I put 1/2 of quart of valvoline durablend 10w-30 and the car felt different, acceleration slow and my MPGs dropped. Any help ? thanks
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Old 06 Nov 2011, 09:01 pm
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Although some manufacturers recommend various weight motor oils for their various engines, it always seems that each engine has it's own personality. The manufacturer recommend 10w30 for my ford. But I discovered that in winter months my engine behaves better with 10w40. Why? Can't tell you. But If i were you, I would seek mechanics advise and also try various weight motor oils for a few days each. And then decide which is better for engine response. Might cost a bit to begin with, but the end result is well worth the testing. Good Luck.
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Old 06 Nov 2011, 09:16 pm
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You use the weight listed in your manual in the glove box. But at 165k, it makes little difference. 10W30 is fine. Do your changes with a good mechanic. He charges $40 against your $20 doing it yourself. So for $20 more you get the car on a lift and he checks your brakes, steering, exhaust, boots and other stuff for free. You get to stand under the car and check it out. You can also ask as many questions as you can think of before he hits the down lever. Plus he gets the old oil. Heck of a deal. Keep a cheap 5 gallon jug of oil in the trunk and check it now and then. Even if you burn a quart every 200 miles, it is not worth fixing the car.

Except for weight, one engine oil brand is as good as any other, so buy the cheap. It all comes out of the same hole in the ground and gets processed by refineries using the same technology. MPG has far more to do with keeping your tires on the up side (36 psi), than it does with oil weight or brand.
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Old 06 Nov 2011, 09:46 pm
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wait, you have a civic with a k20a3??? so you have an 02-05 Rsx type S engine swap? thats pretty cool in an 03, definatly making more power.. btw being as its got the k20a3, the odo mileage doesnt tell you much about it, i would suggest sticking with 5w30 mobil one, and if i may suggest, go full synthetic, also get your self a magnetic drain plug, i realize its an aluminum block, and aluminum is not magnetic, but alot of the parts in it are not aluminum, so it will still help. i highly suggest sticking to 5w30 for atleast 2 changes, and look at your mpg and the feel of the car thru all that... oh and use a good filter too, mobil one filter and royal purple make great filters..

by the way i can feel a difference with a cheap filter and good quaility filter, and not all oil is equal, not at all. look into some of the people who have done oil analysis tests. some still have wear left after 15k, some are done after 5k, not all oil is created equal, anyone who has said that, has simply heard that, and is passing on the info. seriously, alot of people have done oil analysis, and thats great info right there, its all proven and real world, rather then in theorey.
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Old 06 Nov 2011, 10:01 pm
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Depends on your geological location and the temp. Since winter is coming you can switch to 5w now and 0w if you need it later.

@Gary - The rsx - s had the k20a2. The base had the a3 with the ep3.
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