edit: spell check, etc..
[ November 26, 2003, 05:58 AM: Message edited by: Patman ]
quote:Me fix.
Originally posted by DavoNF: Doesn't seem to be working.
![[Wink]](images/icons/wink.gif){kind=icon}
Kinetic Energy = 1/2 (mass)(velocity)(velocity)
If you are driving on the Autobahn @ 140 mph, it requires approx four times the Hp that it does at 70 mph. This results in much higher engine loads, and you can easily see sustained oil temps of 250F-270F. This is particularly true with an engine that's designed/geared like this Honda - it's practically a motorcycle engine.
An SAE 20w-50 oil running @ 250F will have approx the same bearing viscosity as a 5w-30 or 10w-30; running @ 210F. A 20w-50 running @ 270F will have the same bearing viscosity as a 5w-20; running @ 210F!
There's no conspiracy here ...it's simple High School Physics. ![[Eek!]](images/icons/shocked.gif){kind=icon}
quote:That is correct, my wife's 2000 Civic manual makes no mention of 5w20 whatsoever, only 5w30 or 10w30.
Originally posted by oilcanboyd: i think 5w-20 was not included b/c this manual is for a 1999 integra and if i recall correctly, honda didnt start recommending 5w-20 until 2001.
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quote:I would agree but would like to add that most of us with Honda's that call for the 5-20 aren't jumping to a 20-50 but rather a good 5-30 or 0-30. I put the Mobil-1 0W-30 Racing oil in my 2003 CRV.
Originally posted by quadrun1: Well in my experience, little 1.6 liter Civic engines run like crap on 20W-50. 20W-50 in a Civic is just plain wrong!
quote:This brings to mind my trips through the desert of Arizona and Nevada during the summer months when it reach's 120 degrees and I cruse 100 in some of those open areas. Myself I'm not comfortable with the 20w oil under those conditions.
Originally posted by TooSlick: CrashZ, Is it safe to assume you're not a Mech Eng or Aero Eng?
quote:Amen. This is the reason that I believe that BMW North America says that you can use Mobil 1 10w-30 even though it is way to thin according to the manual. I think the manufactures expect the car will never see that type of high speed sustained driving. If you run the CST numbers you will find that for approximately every 30F increase in tempurature, an oil drops one grade in weight, so like said above, 20 weight at 210F = 30 weight at 240F = 40 weight at 270F. The funny thing about the comparison between driving in Europe (specifically Germany) and the American west is that speeds are remarkably similar. Yes, in Germany there are people driving at speeds of up to 150mph plus, but for the most part cars drive about 85-100 mph (something about $5/gallon gas that makes you think about fuel economy). Here in the West, I often see in low population areas (Highway 5 from LA to the Oregon Border) average speeds of 80+ up to the 95 or so. Lets not mention the fact that in the american west temps can easily be 105f plus in the summer compared to Germany's 85F or so. Bottom line to me is that everyone should consider their driving habits and climate. If you have a new honda and drive like a grandma never going over 70mph or using full throttle, 5w-20 is fine. If you have the same car and are driving around Arizona in the middle of summer at 90+mph, a heavy 30 weight or light 40 weight (i.e. GC or M1) are probably a good idea. Me, I'll stick with my one size fits all M1 0w-40, unless I defect to Redline 5w-40. Cary
Originally posted by TooSlick: CrashZ, Is it safe to assume you're not a Mech Eng or Aero Eng?
