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Engine Oil Weight (Viscosity) |
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6PakBee 
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Charter Member Joined: Jul/01/2007 Location: North Dakota Status: Offline Points: 5457 |
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 Topic: Engine Oil Weight (Viscosity)Posted: Jun/26/2016 at 7:38am |
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I looked at kcsamc's "For Sale" post with the Rambler oil http://theamcforum.com/forum/memorabilia-items-for-sale-rockford_topic80575.html .
What caught my eye was that it's 5W-20. With all of the concerns about oil pressure in an AMC V8 isn't that a bit light? Just curious, nothing else. |
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Roger Gazur
1969 'B' Scheme SC/Rambler 1970 RWB 4-spd Machine 1970 Sonic Silver auto AMX All project cars. Forum Cockroach |
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bubbarules1958
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Joined: May/02/2016 Location: California Status: Offline Points: 125 |
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Posted: Jun/26/2016 at 8:22am |
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It was probably sold in a cold climate?
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bcsideshow
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Posted: Jun/26/2016 at 9:04am |
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They do say "Winter" motor oil on back. Cool items
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1969 SCRambler "B"
1970 AMX 390 Auto 1968 AMX 390 Auto 1970 Rebel Machine Project 1969 AMX 390 4SPD Project 1969 AMX 390 Auto Project 1969 Javelin 390 project 1997 Cherokee lifted 1998 TJ Lifted |
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BDCVG
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Joined: Dec/19/2007 Location: Endless Mtns. Status: Offline Points: 993 |
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Posted: Jun/26/2016 at 9:08am |
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T
Edited by BDCVG - Jun/26/2016 at 10:58am |
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1970 AMX 390 5 spd full Control Freaks front and rear suspension
2014 E63 AMG-S wagon 1965 Austin-Healey 3000 MK III |
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6PakBee
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Posted: Jun/26/2016 at 9:09am |
Good point. |
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Roger Gazur
1969 'B' Scheme SC/Rambler 1970 RWB 4-spd Machine 1970 Sonic Silver auto AMX All project cars. Forum Cockroach |
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uncljohn
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Posted: Jun/26/2016 at 9:17am |
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Picking a TSM at random from the library, 5W20 oil used only below Zero degrees F with the caution not to have sustained high speeds above 55 mph since oil consumption may be greater under these conditions.
A condition oil viscosity vs temperature charts of the era supported. |
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70 390 5spd Donohue
74 Hornet In restoration 76 Hornet, 5.7L Mercury Marine Power 80 Fuel Injected I6 Spirit 74 232 I-6, 4bbl, 270HL Isky Cam |
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WesternRed
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Posted: Jun/27/2016 at 5:03am |
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68 TSM:
 The oil consumption is for single viscosity 5W oil, I think 5W-20 would be ok. |
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maximus7001
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Posted: Jun/27/2016 at 5:53am |
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5w20, 5w30 and since the 1990's 0w30 have been around so when the temperature gets to -30c or colder the cam and valvetrain can get oil in a semi timely manner on cold starts. Also thicker oils can overpower a starter in super cold climates.
We have severe cold weather here in Winnipeg that could kill you in short order if you are not prepared. Sometimes the oil light stays on for 30 seconds or more after the engine has started when using the wrong oil. This is common in some climates. A block heater does not heat the oil in the pan. A VW oil heater does heat the pan oil. Just don't use too thin of an oil in the summer or risk engine failure. |
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1968 Javelin SST
1997 GMC Safari AWD 2001 Daewoo Nubira SX (Winnipeg only model) 1997 Honda Accord EX (Canadian Model) Winnipeg, home of the Jets. |
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uncljohn
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Posted: Jun/27/2016 at 10:21am |
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quote The oil consumption is for single viscosity 5W oil, I think 5W-20 would be ok. unquote I think not! AMC engines were not designed to be run on a steady diet of a light weight oil. The caution on using light weight oils is dependent on the ambient temperature being cold. Cold being below zero degrees. Temperature vs viscosity tables say the same thing. It has been documented that engines announced during that same time frame or era that were supposedly supposed to be able to tolerate being run on light weight oils had life spans of less than 100,000 miles and failed due to running hot and piston rings being carboned into their lands thus having excessive oil consumption leading to premature engine failure. Using a light weight oil out side of the temperature range indicated is a very chancy proposition and rebuilding things due to failure is an expensive and unnecessary risk when it can be avoided by using the proper weight range or viscosity range for the temperature you live and operate your cars in. As I do not live where zero degrees is even a remote possibility I have no reason to use a 5W20 oil ever! |
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70 390 5spd Donohue
74 Hornet In restoration 76 Hornet, 5.7L Mercury Marine Power 80 Fuel Injected I6 Spirit 74 232 I-6, 4bbl, 270HL Isky Cam |
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shopandsurf
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Posted: Jun/28/2016 at 5:31am |
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Found this link a while back when rebuilding my engine. There is allot of info in there but I cannot speak for the validity.
http://www.bobistheoilguy.com/motor-oil-101 What did sink in is that you want flow to the system. Reading a high pressure does not mean your system is in good health and getting the flow it needs. I was able to use 5W-20 and get the correct pressures. I saw this post and was also thinking I would increase my viscosity just to be safe. I am going to change to the 10W-30 to hedge my bet.
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1969 AMX 390 AT Go Pac Bittersweet |
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bcsideshow wrote: