[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [New Search]
<x-charset iso-8859-1>Im afraid I disagree. First off... 10W30 means that its designed to have the same cold viscosity as a 10wt at that temp and hot as a 30wt at that point. so 10W30 will act like a 30wt at operating temps and a 10wt when its really cold. This being said... the reality is not so ideal... a 10W30 is actually more like a 15W25 or so which is why 10W40 is so popular. I actually have 1-2psi more oil pressure hot with 10W40 than straight 30wt. With modern oils... there is one advantage to using the multi-vis over the straight oils these days: Viscosity enhancers! The straight weights dont have them but the multi's do. Our engines dont run that much hotter than the water cooled ones... the additives dont break down at our temperatures,,, at least not in 3Kmi. Oils today are MUCH better than they were when our cars were new! Ive picked up all this info as I helped design and test contamination and viscosity sensors for the diesel engines on locomotives for GE. No properly built engine will be damaged by 10W30, its not until they are very old and worn that you need to use the heavier oils... too heavy an oil will actually not flow properly through tight bearing clearances. Lasty... as for cavitation, you are correct that our cars do suck dry sometimes on corners in a stock configuration... which is why I added the 1.5qt sump... which eliminates it. Thicker oil should not make a significant difference how easily it starves on turns my 2cents... OK, maybe 3. Keith > There has been a lot of talk about oils as of late. I would like to present a > few facts here. The VW air-cooled engine was built to run on 30 weight oil. > Nothing has changed on this engine design since the engineers in the Black > Forest (I know, Wolfsburg is far from there, but Dr. Porsche was in Stuttgart > during the design back in the 30's) designed it for that single weight oil. > > With that said, if you run a multi weight oil.... you are running oil weight > of the lowest number. if you use 10-30, you are using 10 weight oil. > Additives break down real fast in these engines so the multi viscosity stuff > does too. If you are running 20-40, you are running 20 weight oil. This > stuff is for modern engines not our beloved air-cools. I have seen several > engines die an early death from 10-30. If the pump is trying to pump light > oil.... cavitation happens. Not good! > > If 30 weight was not used in our engines anymore, why does Castrol make a > great one. So does Kendal. So does Pennzoil. > > Just my thoughts....... Flat4pat > > ------------------------------------------------ > To unsubscribe, E-mail to: <type3-off@vwtype3.org> > For more help, see http://vwtype3.org/list/ > ------------------------------------------------ To unsubscribe, E-mail to: <type3-off@vwtype3.org> For more help, see http://vwtype3.org/list/ </x-charset>