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05-20-2015, 06:50 PM | #1 |
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5w/20 oil OK to use?
yes I am hanging on... I have several cases of 5w/20 left over from a modern car we sold.
Can I use it in my Model A, unknown history, runs well, no smoking? Should I blend it with straight 30w, or is it OK on its own? Maybe a little STP additive? |
05-20-2015, 06:54 PM | #2 |
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Re: 5w/20 oil OK to use?
i wouldnt use it or mix it with anything to use it.
if you were close by i would take it off your hands, as many newer cars spec for that Last edited by Mitch//pa; 05-20-2015 at 07:56 PM. |
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05-20-2015, 07:11 PM | #3 |
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Re: 5w/20 oil OK to use?
I would not use in a Mural Asell it to friendwrong oil for that car goodluck
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05-20-2015, 07:54 PM | #4 |
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Re: 5w/20 oil OK to use?
Too thin !
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05-20-2015, 08:05 PM | #5 |
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Re: 5w/20 oil OK to use?
Too thin for me, I use 20w 50w in mine, hot down here..
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05-20-2015, 08:52 PM | #6 |
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Re: 5w/20 oil OK to use?
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Although it is much thinner than what most of us use, it no doubt would keep the metal components apart. When building a high performance motor, it is important to have as much oil flowing through the bearings as possible (to cool them). Might even find that it is better than thick oil. It is worth noting that oil film strength is not so closely related to viscosity as it used to be because of the additives they put in there nowadays. I bet I get lots of feedback on that one!!!
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05-21-2015, 12:37 AM | #7 |
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Re: 5w/20 oil OK to use?
Crossing Russia mid-winter I MIGHT use it.
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05-21-2015, 02:21 AM | #8 |
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Re: 5w/20 oil OK to use?
I've got a mix of 20/50 and 10/40 in mine
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05-21-2015, 11:16 AM | #9 |
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Re: 5w/20 oil OK to use?
Why not use it in your 'modern' cars ? Most cars within the past decade call for that [ if not full syn].
I wouldn't use it in an 'A'. I also don't believe in additives like STP or mixing oils. |
05-22-2015, 01:30 AM | #10 |
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Re: 5w/20 oil OK to use?
If it were 5W-30, it'd be perfectly fine, but 5W-20 MAY be a little light when hot.
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05-22-2015, 02:13 AM | #11 |
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Re: 5w/20 oil OK to use?
Should be fine in winter.
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05-22-2015, 03:49 AM | #12 |
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Re: 5w/20 oil OK to use?
I would sell it and use the proceeds to buy a more suitable oil.
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05-22-2015, 07:29 AM | #13 | |
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Re: 5w/20 oil OK to use?
Quote:
http://www.bobistheoilguy.com/motor-oil-101/ |
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05-22-2015, 08:27 AM | #14 | |
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Re: 5w/20 oil OK to use?
Quote:
I can imagine late model engines can get away with thinner oil due to tighter clearances and a better oiling system than engines that were designed in early 1900's. I have to agree with most of the responders to this thread - Use the 5W20 in newer cars as called for by the engine designers.
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05-22-2015, 10:42 AM | #15 |
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Re: 5w/20 oil OK to use?
I would not use it in my lawn mower !
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05-22-2015, 02:16 PM | #16 |
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Re: 5w/20 oil OK to use?
Not knowing much about this question but I would agree with this comment. It would seem like where you lived and what time of year is was.
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05-22-2015, 04:51 PM | #17 |
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Re: 5w/20 oil OK to use?
Modern low end multi-viscosity oils enable new car makers to achieve the MPG figures required by Gov.
In an A, I use SAE 30HD. I would switch to SAE 20 HD if cold weather usage is planned. Old timers who came into our family Texaco in the 1950's used SAE 20 year 'round in southern New England. Rocketsled |
05-23-2015, 01:23 AM | #18 | |
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Re: 5w/20 oil OK to use?
Quote:
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05-23-2015, 09:32 AM | #19 |
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Re: 5w/20 oil OK to use?
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05-23-2015, 03:35 PM | #20 | |
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Re: 5w/20 oil OK to use?
Quote:
MOST people (inc mechanics and piles of people on here) still don't understand it (even if they think they do )
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05-24-2015, 09:16 AM | #21 | |
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Re: 5w/20 oil OK to use?
Quote:
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05-25-2015, 04:58 AM | #22 | |
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Re: 5w/20 oil OK to use?
Quote:
As the oils heat to operating temperature, the flow differential narrows, so the xW-20 and xW-30 will have similar flows. The problems come along when the oil cools - example: 5W-30 and SAE 30 are the same at operating temps, but if it's cooler (like a cold start), the SAE 30 thickens a LOT more, and provides less protection, as oil pressure increases, and flow decreases - it can't flow to where it's needed. The second number tells the hot viscosity measurement. The 20 part says it thins more than a xW-30 which in turns more than xW-50 when hot. The W is for "winter" and this first number ONLY specifies viscosity range at 40C (cold). The second number ONLY specifies the viscosity range at 100C (hot). The two numbers are unrelated to each other. If SAE 30 is what Henry specified for your climate etc, then the ultimate oil to reduce wear is 0W-30, as it's the closest you'll get to a contsant viscosity, which is GOOD for the engine! Ideally, you'd have an oil that has the same viscosity cold and hot, but all oils thicken somewhat on cooling. Remember that multi-vis was NOT invented until the Model A was well over 20 years old, so Henry didn't specify it (actually, he couldn't!) People say a certain oil is too thin, but thin is GOOD, to a point - too thick reduces flow and it can squeeze out of bearings before it is replaced sufficiently. That oil like water is what is protecting your engine - as it cools and gets thicker, it's protecting less and less (which is why so much wear happens on cold starts - thick oil!). HIGH oil pressure can also be bad, as it means there is a restriction after the pressure measurement point, and the oil pressure gauge does NOT measure the pressure at the bearings, it measures it at the pump, BEFORE the restriction that stops it flowing to the bearings. It's the Film strength that protects the bearings, not the pressure. Ideally, the engine will run with an oil temp of close to 100C (212F), and that is the temperature that the oils are at "operating temperature". Those people who "feel" an oil, and it's thickness out of the bottle, are forgetting an engine isn't in a happy place at room temperature, and neither is the oil - their ideal environment is WAY hotter than any room temperature a Human would be happy in! Instead of using the SAE ratings as they are now, they'd used the viscosity range measurements (cSt - centistokes), the numbers would be easier to understand, and more meaningful: The ratings would convert something like: SAE avg cSt range "(cold)W-(hot)" SAE 30 = 100W-12 (!) 20W-30 = 55W-12 10W-30 = 25W-12 5W-30 = 18W-12 0W-30 = 14W-12 <<< most consistant viscosity And the 12cSt is "ideal" for an engine "designed" for SAE30 originally, which also has is viscosity of 12 at operating temp, shown on the top line, along with all the other oils with a SAE30 "hot" rating. Other examples: 20W-40 = 55W-15 15W-50 = 40W-19 SAE40 = 150W-15 (!) Rating it this way would give people a much better understanding of which oils are thicker cold or hot etc, and if explained with the principles of engine operating conditions would let people be much better informed about oil, and avoid all the confusion!
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05-25-2015, 05:45 AM | #23 |
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Re: 5w/20 oil OK to use?
Use it, that A engine does not care what you use as long as it is slippery and clean.
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05-25-2015, 06:45 AM | #24 | |
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Re: 5w/20 oil OK to use?
Quote:
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05-25-2015, 06:46 AM | #25 |
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Re: 5w/20 oil OK to use?
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