5W-30 or 10W-30?

asdf · 10-06-2007, 11:22 PM

well its time for my oil change in my 07 si. i live in texas so it doesn't really get too cold here during the winter.

question is, would it just be best to use 5W-30? or is there a big difference with using 10W-30?

RedLineSi · 10-06-2007, 11:39 PM

Honda recommends 5W-30

BigT · 10-06-2007, 11:40 PM

You wouldn't get much benefit from 10w30. At operating temp they both provide the same viscosity (30). You are probably best just sticking with 5w30.

shipo · 10-07-2007, 02:06 PM

...this time it's me.

Instead of 10W-30 or even 5W-30, personally I would use 0W-30, a far superior oil in all regards and in all seasons.

HondaFamilyMan · 10-07-2007, 02:36 PM

Quote:

Originally Posted by RedLineSi

Honda recommends 5W-30

I thought Honda recommends 5w-20....

fernando47 · 10-07-2007, 02:38 PM

Quote:

Originally Posted by HondaFamilyMan

I thought Honda recommends 5w-20....

not for the si. it says in the oil cap 5w-30

e60.deluxe · 10-07-2007, 02:54 PM

if it doesnt get really cold, the 2nd number is really the only one that matters.

Firestrife · 10-07-2007, 04:06 PM

doesnt make a difference just go with the 5W just to be sure.

02civicsi · 10-07-2007, 07:14 PM

Next oil change I'm going to 0W20 or 0W30. I'm currently running 5W20.

***Whocares05050*** · 10-07-2007, 07:36 PM

So what benifits / cons would it make if i ran 10w-30 mobile 1 versus 5w-30 mobile 1?

Clutchmaster · 10-07-2007, 07:39 PM

Quote:

Originally Posted by RedLineSi

Honda recommends 5W-30

yeah use that.....

**NitrousG35** · 10-07-2007, 07:43 PM

I would stay with the 5W-30, as that is what is recommended. With the newest oils, 5W is light enough to ensure a fast warmup, especially on colder days. The 30W is fine when it is hot. I had the same question about my G35, but all the research says the cars run better and get better fuel economy with 5W-30.

If you want a high quality oil, get Royal Purple. I am running it in my G35 and will run it in my Si when the time comes to change out the oil. HotRod TV showed that on a dyno, Royal Purple made a few extra horsepower.

shipo · 10-07-2007, 07:55 PM

The lower the first number, the quicker it is flowing through your engine upon a cold start. For me at least, that is enough of a benefit to justify using 0W-whatever in all of my cars.

***Whocares05050*** · 10-07-2007, 08:16 PM

Well yeah, you live in NH, but i live in florida. lol. i think its 85 degress 10 months outta the year.

02civicsi · 10-07-2007, 08:19 PM

I live in Central FL & I've run 0W20 in my previous Civics('98 & '02).

televascular · 10-07-2007, 08:37 PM

Okay, hold on. There are some truths and half-truths here.

If money is no issue, buy Amsoil's new SSO 0W-30. It is the absolute best year-round oil for the K20. The only downside is the price, though you can get a discount for joining the Preferred Customer program.

0-weights are indeed the "best" at circulating oil at start-up. Independent testing has confirmed that 50-90% of total accumulated engine wear can occur during the first minute of cold start-ups. The Amsoil I mentioned has an extremely low-temp pour point. However, if you are comparing Mobil 1 0W-30 to Mobil 1 5W-30, the difference in viscosity is very small, so it's not worth spending the effort to find it. A five-quart jug of M1 5W-30, however, can be found at Walmart for a little less than 20 bucks. It's a great oil, despite the recent controversy surrounding its formulation change.

0-weights are also beneficial to the overall lubrication and performance of your engine. Read this dissertation to find out why. A 10-weight is heavier than necessary for our high-revving powerplants. Contrary to popular opinion, viscosity does not provide lubrication; flow = lubrication, to an extent.

I would also stick to an XW-30 than a XW-20. Our engines can get hot very quickly from super-high rpms. You want the extra protection up in that range.

Also, Royal Purple has occasionally shown increased Pb and Fe wear in used oil analyses. For this reason alone, I'd avoid it on principal. Stick with Amsoil, M1, PP, GC, or other oils Honda engines have been known to appreciate.

02civicsi · 10-07-2007, 08:43 PM

Yes due to our high revving nature the 30 weight oil will shear down to a 20 weight. I'm currently using RP 5W20 but I'll be switching to Amsoil 0W20 on my next oil change.

**NitrousG35** · 10-07-2007, 08:43 PM

Quote:

Originally Posted by televascular

Also, Royal Purple has occasionally shown increased Pb and Fe wear in used oil analyses. For this reason alone, I'd avoid it on principal. Stick with Amsoil, M1, PP, GC, or other oils Honda engines have been known to appreciate.

Where did you hear this about Royal Purple? That is news to me.

02civicsi · 10-07-2007, 08:47 PM

I got introduced to RP by my wife's uncle who runs a motorcyle shop. He swears by RP for his bikes that he works on in his shop.

The great oil debate shall commence here forth.

TOMMIELOEKO · 10-07-2007, 08:49 PM

5w-30 over here!

10-06-2007, 11:22 PM	#1 (permalink)
asdf Senior Member Join Date: Jun 2007 Posts: 1,029 iTrader: 5 / 100%	5W-30 or 10W-30? well its time for my oil change in my 07 si. i live in texas so it doesn't really get too cold here during the winter. question is, would it just be best to use 5W-30? or is there a big difference with using 10W-30?

10-07-2007, 02:06 PM	#4 (permalink)
shipo Senior Member Join Date: May 2007 Location: New Hampshire Age: 51 Posts: 494 iTrader: 0 / 0%	There's one in every crowd... ...this time it's me. Instead of 10W-30 or even 5W-30, personally I would use 0W-30, a far superior oil in all regards and in all seasons.

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e60.deluxe Senior Member Join Date: Apr 2007 Location: Lake Forest, CA Age: 22 Posts: 4,957 iTrader: 3 / 100%	if it doesnt get really cold, the 2nd number is really the only one that matters.

10-07-2007, 04:06 PM	#8 (permalink)
Firestrife Senior Member Join Date: May 2007 Location: Gainesville, FL Age: 20 Posts: 3,372 Keenan iTrader: 9 / 100%	doesnt make a difference just go with the 5W just to be sure.

10-07-2007, 07:14 PM	#9 (permalink)
02civicsi Senior Member Join Date: Jan 2007 Location: Lonnngwoooood, FL Posts: 7,493 I am the Juggernaut!!! iTrader: 18 / 100%	Next oil change I'm going to 0W20 or 0W30. I'm currently running 5W20.

10-07-2007, 07:36 PM	#10 (permalink)
*Whocares05050* WHOcaREs05050 Join Date: Oct 2007 Location: SOFLA Age: 22 Posts: 13,165 Mike iTrader: 6 / 100%	So what benifits / cons would it make if i ran 10w-30 mobile 1 versus 5w-30 mobile 1?

10-07-2007, 07:43 PM	#12 (permalink)
NitrousG35 Mr. Cowl Induction Join Date: May 2007 Location: To Infiniti and beyond... Posts: 10,502 Wild VTEC'n Bill iTrader: 3 / 100%	I would stay with the 5W-30, as that is what is recommended. With the newest oils, 5W is light enough to ensure a fast warmup, especially on colder days. The 30W is fine when it is hot. I had the same question about my G35, but all the research says the cars run better and get better fuel economy with 5W-30. If you want a high quality oil, get Royal Purple. I am running it in my G35 and will run it in my Si when the time comes to change out the oil. HotRod TV showed that on a dyno, Royal Purple made a few extra horsepower.

10-07-2007, 07:55 PM	#13 (permalink)
shipo Senior Member Join Date: May 2007 Location: New Hampshire Age: 51 Posts: 494 iTrader: 0 / 0%	The lower the first number, the quicker it is flowing through your engine upon a cold start. For me at least, that is enough of a benefit to justify using 0W-whatever in all of my cars.

10-07-2007, 08:16 PM	#14 (permalink)
*Whocares05050* WHOcaREs05050 Join Date: Oct 2007 Location: SOFLA Age: 22 Posts: 13,165 Mike iTrader: 6 / 100%	Well yeah, you live in NH, but i live in florida. lol. i think its 85 degress 10 months outta the year.

10-07-2007, 08:19 PM	#15 (permalink)
02civicsi Senior Member Join Date: Jan 2007 Location: Lonnngwoooood, FL Posts: 7,493 I am the Juggernaut!!! iTrader: 18 / 100%	I live in Central FL & I've run 0W20 in my previous Civics('98 & '02).

10-07-2007, 08:37 PM	#16 (permalink)
televascular Senior Member Join Date: Apr 2006 Location: New Jersey Posts: 275 iTrader: 0 / 0%	Okay, hold on. There are some truths and half-truths here. If money is no issue, buy Amsoil's new SSO 0W-30. It is the absolute best year-round oil for the K20. The only downside is the price, though you can get a discount for joining the Preferred Customer program. 0-weights are indeed the "best" at circulating oil at start-up. Independent testing has confirmed that 50-90% of total accumulated engine wear can occur during the first minute of cold start-ups. The Amsoil I mentioned has an extremely low-temp pour point. However, if you are comparing Mobil 1 0W-30 to Mobil 1 5W-30, the difference in viscosity is very small, so it's not worth spending the effort to find it. A five-quart jug of M1 5W-30, however, can be found at Walmart for a little less than 20 bucks. It's a great oil, despite the recent controversy surrounding its formulation change. 0-weights are also beneficial to the overall lubrication and performance of your engine. Read this dissertation to find out why. A 10-weight is heavier than necessary for our high-revving powerplants. Contrary to popular opinion, viscosity does not provide lubrication; flow = lubrication, to an extent. I would also stick to an XW-30 than a XW-20. Our engines can get hot very quickly from super-high rpms. You want the extra protection up in that range. Also, Royal Purple has occasionally shown increased Pb and Fe wear in used oil analyses. For this reason alone, I'd avoid it on principal. Stick with Amsoil, M1, PP, GC, or other oils Honda engines have been known to appreciate.

10-07-2007, 08:43 PM	#17 (permalink)
02civicsi Senior Member Join Date: Jan 2007 Location: Lonnngwoooood, FL Posts: 7,493 I am the Juggernaut!!! iTrader: 18 / 100%	Yes due to our high revving nature the 30 weight oil will shear down to a 20 weight. I'm currently using RP 5W20 but I'll be switching to Amsoil 0W20 on my next oil change.

10-07-2007, 08:47 PM	#19 (permalink)
02civicsi Senior Member Join Date: Jan 2007 Location: Lonnngwoooood, FL Posts: 7,493 I am the Juggernaut!!! iTrader: 18 / 100%	I got introduced to RP by my wife's uncle who runs a motorcyle shop. He swears by RP for his bikes that he works on in his shop. The great oil debate shall commence here forth.

10-07-2007, 08:49 PM	#20 (permalink)
TOMMIELOEKO Senior Member Join Date: Sep 2007 Location: 15bucks lil man, put that sh*t in my hand!!!!!!!!!! Posts: 8,096 Shake & Bake!!!! iTrader: 2 / 100%	5w-30 over here!