Gain extra benefits by becoming a Supporting Member Click here find out how!
Classic Performance Products Classic Parts
Ciadella InteriorsAmerican Auto Wire Classic Industries
Chevs of the 40sDanchuk Catalog
Hellwig Products IncPerformance Rod & CustomEcklers AutoMotive
Octane LightingNu-Relics Power Windows
Impala Bob's Bob's Chevy Trucks Bob's Chevelle Parts Bob's Classic Chevy

Username Post: What weight Engine oil        (Topic#345455)
Dungbeetle 
Forum Newbie
Posts: 51
Dungbeetle
Loc: Somerset, England, UK
Reg: 09-26-12
06-15-17 03:45 PM - Post#2696061    

I've searched the forum without success so I'll ask the question.

For a 1962 C10, straight 6 235, what weight Engine oil ? and how much would I need for an oil change ?

I live in England UK so it's not massively hot, or hugely cold.

Thanks in anticipation.



 
bobschevytrucks.com Ecklers LMC Trucks

62chevy427 
"11th Year" Silver Supporting Member
Posts: 2073
62chevy427
Loc: laurens sc
Reg: 04-13-06
06-15-17 05:30 PM - Post#2696073    
    In response to Dungbeetle

I would use straight 30w oil or maybe 10w30.
it takes 5qts with a filter.

56 bel air ((since 2002)
62 impala ss (since 1965)
65 el camino (since 1969)
66 nova (since 1987)
67 malibu convertible (since 1981)
72 el camino ss454 (since 1985)
83 gmc 4wd (since 1991)
95 impala (new)
14 camaro (new)


 
Vaughn 
"15th Year" Gold Supporting Member
Posts: 18770
Vaughn
Loc: Colorado Springs, CO
Reg: 08-08-04
06-15-17 08:24 PM - Post#2696099    
    In response to 62chevy427

Multi-viscosity oil is the gold standard of lubrication, and yes, even on old motors like the 235.

10w-30 or 10w-40 oil is superior because it stays at nearly the same viscosity within a large range of temperature variations. Even at extremely low outside temperatures, the viscosity of the oil stays nearly the same as at very high engine temperatures - which makes the pressure of the motor oil very stable. Stable oil pressures keep the oil "pressure wedge" very constant, so that rod and main engine bearings don't contact the crankshaft during engine operation - so there is less overall wear in the engine bearings, and on the rest of the wear areas, like on the camshaft and lifters, timing chain and gears, etc.

There are people that insist that the only thing to use in a motor that was designed to use straight 30 grade motor is straight 30 grade motor oil. Single grade motor oil has been completely proven less able to resist wear than any SAE multi grade motor oils currently available on the market, time and time again.

The people that believe in only using straight grade mineral oil often believe that oil pressure remains higher in the motor using the straight grade. This is usually due to increased waxing agents in the single grade oil creating some restriction in how the oil leaks out of the bearings - but this is not actually providing better lubrication, it just partially covers up the problem.

What motor oil you use depends on the amount of clearance there is between the bearings and the crankshaft, because this is what determines how much oil pressure is in the engine during normal operation. Typically, if it is a brand new engine that has .002 inch clearance between the bearing and the crank, you would use 10w-30 oil. If you have .003 inch clearance, you would normally use 10w-40. If your engine has had a long time since it's last rebuild and your oil pressure at idle is less than 10 psi, you would want to use something like 20w-50 to increase your oil pressure above 10 psi at hot idle.

If you have less than 10 psi with 20w-50 oil, you likely have too much clearance between the bearings and the crankshaft, which usually means it is time to rebuild the motor or at least replace the bearings and freshen up the crankshaft.

If it is a 235, 1962 was the last year for that motor, and it had a pressure based oil system instead of a splash oil system that most 235s had in the 40s and much of the 50s. The unfortunate thing about that motor is that it had a tendency to wear out the bearings far too quickly.

I saw a number of 235s go to the junkyard from 50s trucks simply because the poured babbit engine bearings had been beaten out of the motor due to less than stellar oil maintenance, and the owner didn't want to mess with having the engines re-babbited.



 
Chevy_Stepside 
Super Senior Member
Posts: 5945
Chevy_Stepside
Age: 54
Loc: San Francisco, Ca, USA
Reg: 07-08-02
06-15-17 10:20 PM - Post#2696105    
    In response to Vaughn

  • Vaughn Said:

If you have less than 10 psi with 20w-50 oil, you likely have too much clearance between the bearings and the crankshaft, which usually means it is time to rebuild the motor or at least replace the bearings and freshen up the crankshaft.

.

And this is why I run 20/50 in mine.. but my pressure is above 10 with 20/50



"A man and his truck, It's a beautiful thing"
The tour is on again. May 1st 2011. $5 I ride 100 miles. http://main.diabetes.org/site/TR?pg=personal&a mp;f...


Edited by Chevy_Stepside on 06-15-17 10:21 PM. Reason for edit: No reason given.

 
Dungbeetle 
Forum Newbie
Posts: 51
Dungbeetle
Loc: Somerset, England, UK
Reg: 09-26-12
06-16-17 03:39 AM - Post#2696111    
    In response to Chevy_Stepside

Gentlemen, you are legends, every one of you, and as ever I'm grateful to you.

Without your assistance, both now and over the last few years, I would not have enjoyed my old girl as much as I do.

Thank you.





 
Chevy_Stepside 
Super Senior Member
Posts: 5945
Chevy_Stepside
Age: 54
Loc: San Francisco, Ca, USA
Reg: 07-08-02
06-18-17 07:35 AM - Post#2696359    
    In response to Chevy_Stepside

I drove my truck the other day, (I don't drive it much) and at idle with 20/50 I get 10 lbs and when accelerating it is almost 30. Good thing I have an engine waiting to go in. When I start the truck is sounds like the spark plugs are half way out. Compressing I bet is pretty low, but it is still kicking.

"A man and his truck, It's a beautiful thing"
The tour is on again. May 1st 2011. $5 I ride 100 miles. http://main.diabetes.org/site/TR?pg=personal&a mp;f...


 
bobschevytrucks.com Ecklers LMC Trucks

Icon Legend Permissions Topic Options
Report Post

Quote Post

Quick Reply

Print Topic

Email Topic

498 Views
FusionBB
FusionBB™ Version 2.1
©2003-2006 InteractivePHP, Inc.
Execution time: 0.247 seconds.   Total Queries: 17   Zlib Compression is on.
All times are (GMT -0800) Pacific. Current time is 07:10 AM
Top