Is 20w50 to much ?? - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 05-12-2001, 10:47 AM
Frank360
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Is 20w50 to much ??

Well, I closed my engine, new intake manifold gasket, and valve cover gaskets... put the old lifters and everything back, and put 20w50 in the engine... I now have 50 and above psi at startup, and it levels down to around 10-15 psi at 700rpm and operating temp... if it goes below that, a little shot from the throttle will get it back up... the good news is I don't hear the clattering noise from the valvetrain anymore [img]/wwwthreads_images/icons/smile.gif[/img], the bad is I still hear a vaccum hiss... it is really obvious when I depress the gas pedal about a quarter of the way... could that come from within the carb?.. or an egr valve or something... anyway, it runs good enough for a 30 year old engine... Any comments on the above, is there a reason why I shouldn't run that oil in my engine ???


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post #2 of (permalink) Old 05-12-2001, 04:01 PM
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Re: Is 20w50 to much ??

Is everybody out wheeling? back to top...

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post #3 of (permalink) Old 05-12-2001, 05:53 PM
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Re: Is 20w50 to much ??

I ran 20W50 in most of my vehicles when I lived in Tucson, but run 10W40 now. IMO its a little heavy unless you live where its really hot.

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post #4 of (permalink) Old 05-12-2001, 07:03 PM
 
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Re: Is 20w50 to much ??

I run 20-50 in my wore out 300 6cyls ford worj truck, actually the last time it was smoking I poured about half a gallon 80-90 in there.

it works fine, if it gets really cold were ytoiu are that thick oil could shear the oil pump drive, it hasnt happened to me yet in this old Ford engine.

In my amc 360 I run 10-30.

but the guinee pig FORD truck has done ok with the thicker stuff, I ran 20-50 thru last winter and it got well below freezing here several times

I know mine is hashed, I assume if your putting htat into yours you know yours is hashed also.

as long as you realize that then put whatever it takes to keep it lubed when its cool, not too much smoke.

when my FORD gets hot (200 deg +) the pressure still drops to nothing even with the 20-50, but it never knocks or anything, its running on borrowed time



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post #5 of (permalink) Old 05-12-2001, 07:09 PM
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Re: Is 20w50 to much ??

Aye Boy , ya livin wid da Lobsters ova on the wrong coast.
I`d smack er down to 10-30 and 5-30 in dem cold New Brunswick winters boy [img]/wwwthreads_images/icons/smile.gif[/img]

Jeff ( Over on the warm side of Canada) Eh



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post #6 of (permalink) Old 05-12-2001, 07:29 PM
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Re: Is 20w50 to much ??

I run 15w-40 in mine. Good compromise between 10w-40 and 20w-50.

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post #7 of (permalink) Old 05-12-2001, 10:25 PM
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Re: Is 20w50 too much ??

Mine is certainly not "hashed" yet, but I run 20W-50 exclusively down here in the South. I've seen too many engines worn out prematurely to risk it. Check the front of an old Haynes manual for the temp ranges for each grade of oil. This site also has some info - scroll down to "Lubricant Related Documents".

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post #8 of (permalink) Old 05-12-2001, 10:32 PM
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Re: Is 20w50 to much ??

I run Valvoline 10w30 in grocery getters or in the winter, racing 40 or 50 in the summer toys, and tractor store 40 or 50 in "well seasoned" engines (along with some thickener)

post #9 of (permalink) Old 05-13-2001, 09:16 AM
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Re: Is 20w50 to much ??

Thanks to all, I'm a little reassured... of course, I live where it's cold... in the winter, it goes all the way to -30C, but in the summer it goes up to +30C.. so I was more experimenting, will probably use the stuff for summer conditions only, since when I'm offroading, I go at turtle speeds, it would help cool down the engine... I was more concern for my oil pump though, didn't want to give it a hard time... When I have money to rebuilt my spare, I'm gonna use synthetic for sure... I got lots of info lately on oil, and crudes suck pretty bad, especially at cold starts...

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post #10 of (permalink) Old 05-14-2001, 01:40 PM
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Re: Is 20w50 to much ??

I run 5W30 Mobil 1 in my 4.0 in N FL. Rarely gets below 20F, Summers in mid to upper 90's for an extended time. Nice to get the breeze from the Gulf. I have not had a problem in 4 years and it pushes 60 lbs at start up and never drops below 40.

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