5W20 vs 5W30? [Archive] - 7th Gen Honda Forum - The #1 Community for 2001-2005 Honda Civic Enthusiasts

: 5W20 vs 5W30?


g-walka3
04-20-2009, 06:10 PM
I was in a parts store yesterday, and bought some Royal Purple. There was a row of 5W20(or so I thought), so I grabbed four bottles from that row, but it turns out that the 3 bottles behind the 5/20 were 5/30.

So I'm wondering if I can mix 1L of 5W20 with the 5W30 and put it in my engine(D17A2)?

Greeenie
04-20-2009, 06:26 PM
yes, wont hurt much at all, i use 5w30 in both my em2 and es1

Matt V
04-20-2009, 07:55 PM
I use 5W-30 just because it's more common. However, once I become a dealer on here I will be selling Amsoil 5W-20 for those that would like it.

d5civic
04-20-2009, 08:32 PM
it's fine, but if you can get 5w-20 in the future then get it. Just stick to the oem recommendations to play everything safe.

Albertross
04-20-2009, 09:30 PM
Considering 5w-20 and 5w-30 have two completely different viscosities at normal operating temperature, your engine will have to work harder when using 5w-30 since it's not the Honda spec for motor oil. Short term may be no problem, but long term your engine life may be shortened.

flatlandtacoma
04-20-2009, 10:13 PM
Mix away. 5w30 will not harm your engine in any way. :coffee:

g-walka3
04-20-2009, 10:28 PM
ok thanks for the advice

skatejosh369
04-20-2009, 10:29 PM
what about 10w?

Unevolved
04-20-2009, 10:41 PM
what about 10w?

The first number is winter weather resistance, i.e. cold starting. Down here in central Texas, I could run 0W-30 or 0W-20 without any issues. It doesn't have any appreciable effect on viscosity.

skatejosh369
04-20-2009, 10:45 PM
so now that its becoming hot i need to switch down to a lower weight? Or do I have that backwards?

Twiss
04-20-2009, 10:46 PM
smartest thing to do is use what the manufacture recommends. using anything is fine for short term but constant usage will affect the life of the engine

Unevolved
04-21-2009, 12:29 AM
so now that its becoming hot i need to switch down to a lower weight? Or do I have that backwards?

Nope, don't do a thing. Just run 5W-20 and you'll be fine, there's no sense worrying about something like oil weight when it will give you no tangible results on a stock motor, you know?

g-walka3
04-21-2009, 12:35 AM
Yeah I'm only planning on running the 5W30 for 5K anyways, since I have it right now. Next time I'll make sure it's all 5/20

Kaotic_Zeus
04-21-2009, 12:35 AM
i wouldn't run anything more than 5w20 or 0w20

why dont some of you just add 10w40 while you're at it... haha

honda rules
04-21-2009, 12:40 AM
This older guy I use to work with, he bought a 07 SI brought it home, change the oil to 20w-50, he said there no problem doing that, and this dude knows his stuff......:dunno:

MidnightCivic
04-21-2009, 07:18 AM
been using 5w30 for 2yrs or longer..no issues at all..motor runs great..

EternalBlueEX
04-24-2009, 02:52 PM
I've been running 5w30 Mobil 1 my car it's whole life, 90,000m no issues at all but I imagine synthetic is really smooth flowing almost like a 5w20 conventional?

kailiwela44
04-27-2009, 03:47 PM
at what temperature would you have to start using oil with a weight grade?

SP4RT4N
04-27-2009, 09:04 PM
some tech at a honda dealer ship said that. since i have 100,000 miles on my car. i should not switch to synthetic.. why is that?

flatlandtacoma
04-27-2009, 09:28 PM
some tech at a honda dealer ship said that. since i have 100,000 miles on my car. i should not switch to synthetic.. why is that?

Because he still believes in old wives tales. Actually this was good advice 25 years ago but is not of much value any more.

Spoon ES2
04-27-2009, 10:17 PM
what books say from pros it is recommeneded to use a sligly high number such as 5w-30 afta about 125k cause ure gaps for the bearings and seals are gettin worn but 5w-20 is what i would use dont run much syntehtic in motors wit higher miles

metalman26
04-30-2009, 01:17 AM
I have done the same thing many times

cheo_papi
04-30-2009, 08:32 AM
when you have a high mileage car, are you not suppose to use thicker oil?
Ive been running 10W40 or 10W30 (i forgot which one) for a couple of years now.

admobandy
05-04-2009, 01:33 PM
when you have a high mileage car, are you not suppose to use thicker oil?
Ive been running 10W40 or 10W30 (i forgot which one) for a couple of years now.


I've read you should run at least 0W-30 or 5W-30 in an OHC motor and increase the
weight and viscosity as the car ages... Probably some horse manure advice but I drove an '84 Camry with 10W-40 from 165,000 - 200,000 miles, then sold it for $500 to some guy that needed a cheapo... Last I heard he was still driving it with over 250,000 miles on it... I beat the crap out of that car... Car started fine in the winter and I live in Wisconsin...

Right now I use 5W-30 full synthetic in my '05 civic with 63,000 miles...

Ian
05-08-2009, 12:24 AM
It is a complete myth that it is bad to run 5w30. 5 weight is 5 weight when the oil is at standing temp. Warm, the difference between 5w30 and 5w20 is minimal. Only negative thing i can mention is that my car will burn about a quart every 1k with 5w30 and with 5w20 its about a quart every 4k. These cars were never meant to be performance oreinted so honda used a weaker, lower resistance set of ringlands to obtain better fuel economy and as a result it is only suggested to run 5w20 because the rings for some reason have a harder time wiping the oil off the cylinder wall as the piston comes to sit at the bottom of its stroke.
My father is a nation wide maint. manager for a school busing company and has many ASE certifications. With over 30 years of experience under vehicles and guiding shop foremans in the proper direction with maint schedules etc. I have yet to ask a question he lacks the info to answer.