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Do single weight oils have a place? #5282451 12/01/19 09:59 PM
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expat Offline OP
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I saw Jay Leno video where he drove an Areo engined Hispano-Suiza, he said he uses straight 50 wt Lucas engine oil.

The engine is hardly stressed, why not use a multigrade? Starting it on a cold 50 wt seems crazy.

Re: Do single weight oils have a place? [Re: expat] #5282453 12/01/19 10:09 PM
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4WD Offline
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Not for me … I have a dozen or so things with gasoline engines and don’t see it recommended for any

Re: Do single weight oils have a place? [Re: expat] #5282459 12/01/19 10:22 PM
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Chris142 Online Content
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My Jeep runs just fine in summer on sae30. So does my tractor.


02 Wrangler Napa high milage 10w40
87 F250 Valvoline 15w40
07 fjcruiser Car lube plus 10w30
Z400 castrol T 10w40
Can am Maveric edge 5w40
57 case tractor Chevron sae30
Re: Do single weight oils have a place? [Re: expat] #5282475 12/01/19 10:53 PM
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JimPghPA Online Content
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Straight weight oils are good for air cooled engines that are ONLY used in warm and hot ambient temperatures such as air cooled engines on lawn mowers. Mono weight oils are less prone to breaking down to a lighter viscosity by sheering when used in hot air cooled engines.


Boy will I be happy when ALL vehicles on public roads are autonomous.


JimPghPa

Re: Do single weight oils have a place? [Re: expat] #5282479 12/01/19 10:56 PM
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Silk Offline
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Running 30 in one of my motorcycles which is a shear factory, working well. I decided to use 30 last year in my BMW R65 as the recommended temps fall in my zone. I also changed my breather for about the 10th time, running the hose external and no filter. All good. So I put my 20W-50 synth back in for this summer (actually for winter), and as the bike is used on a lot of gravel, noticed my rear wheel was dirty, like chain lube on the wheel. It's oil coming out the breather. Never happened with the 30.


1987 BMW R65 - Penrite VTwin 20-50
2005 Nissan Expert - 5W-30 Castrol Edge
1996 Volvo T5 - Penrite HPR15 - 15W-60. Ryco syntec filter.
Re: Do single weight oils have a place? [Re: expat] #5282484 12/01/19 11:04 PM
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sloinker Online Shocked
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Air compressors, turbines, gearboxes......


'16 Tiguan TSI Ravenol VST 5W40
'15 VW Golf TDI Ravenol VMP 5W30
'15 VW Golf Sportwagen TDI VMP 5W30
'14 Dodge Grand Caravan 3.6 Red Line Blue Label 5W20
'64 Plymouth Fury440 Red Line Blue Label 10W40
Re: Do single weight oils have a place? [Re: expat] #5282487 12/01/19 11:22 PM
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expat Offline OP
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So assuming Jay Leno is being advised by someone knowledgeable, and expence is no real object, has anybody any idea why a 50 wt would be spec'd?

I think think the engine holds about 8 gallons!

Re: Do single weight oils have a place? [Re: 4WD] #5282494 12/01/19 11:37 PM
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bbhero Offline
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Originally Posted by 4WD
Not for me … I have a dozen or so things with gasoline engines and don’t see it recommended for any



You could likely run a SAE 30 year round where you're at 4wd... But you are too cool for that LOL


Nissan Altima 3.5 Coupe
Napa full synthetic 5w30 Wix 57356 Oil filter
"Treat your family like your friends and treat your friends like your family."
Re: Do single weight oils have a place? [Re: expat] #5282521 12/02/19 12:48 AM
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CharlieBauer Offline
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An SAE50 starting at 20c is about as thin as a 5w20 starting at -10c.


It ain't what you don't know that gets you into trouble. It's what you know for sure that ain't so.

- mistakenly attributed to Mark Twain
Re: Do single weight oils have a place? [Re: expat] #5282547 12/02/19 03:43 AM
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RDY4WAR Offline
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Grade... not weight.

...and no, I see no reason for it unless you needed an extremely shear stable mineral oil with no VII whatsoever. (IE: Nitro 70)

Last edited by RDY4WAR; 12/02/19 03:45 AM.

"He who is without oil, shall throw the first rod." - Compressions 9:1
Re: Do single weight oils have a place? [Re: sloinker] #5282565 12/02/19 05:16 AM
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Originally Posted by sloinker
Air compressors, turbines, gearboxes......

Add Transformers.

I use to use a straight 30..30+ years ago while living in the valley of SoCal. But living up north like I do now, a multi grade is the way to go. I can just stock one lube, a 5w30, and be good year round.

Plus today's engines run hotter and rev higher, so I think the high VI of multi grades are a better fit overall???

Last edited by Mad_Hatter; 12/02/19 05:36 AM.
Re: Do single weight oils have a place? [Re: expat] #5282569 12/02/19 05:29 AM
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Bailes1992 Offline
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I wish I could get a good a good API SN or even SM monograde 30 oil in the UK. My Defender which doesn't get used below freezing and my Mondeo for 9 months of the year would be perfect for one!


19 Volvo V40 D3 Auto - 96 Defender 300TDi - 03 Ford Mondeo ST 3.0 V6
Engine - Castrol Edge 5w30 LL
Manual - Fuchs Sintofluid 75w80
ATF - Comma MVATF
Diff & Transfer - Fuchs Sintopoid 75w90
Re: Do single weight oils have a place? [Re: expat] #5282572 12/02/19 05:56 AM
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Originally Posted by expat
So assuming Jay Leno is being advised by someone knowledgeable, and expence is no real object, has anybody any idea why a 50 wt would be spec'd?

I think think the engine holds about 8 gallons!

Comparing vintage piston aircraft engines to modern econobox car engines is apples and donuts. Just what oil do you think he should use? TGMO 0w-20?


2013 F150 5.0, Delo XLE CK-4 10W-30, Baldwin B7449
2010 Camry 2.5, PP 10W-30, Mobil1 M1C-251A
Re: Do single weight oils have a place? [Re: expat] #5282581 12/02/19 06:19 AM
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Fawteen Offline
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Originally Posted by expat
I saw Jay Leno video where he drove an Areo engined Hispano-Suiza, he said he uses straight 50 wt Lucas engine oil.

The engine is hardly stressed, why not use a multigrade? Starting it on a cold 50 wt seems crazy.


You do realize that the engine is 1914-design piston pounder, right? And you do realize that aircraft engines of that vintage have significantly different lubrication requirements than a modern day automotive engine, right? And you also understand that Leno has his "garage" in southern California where it's not really all that cold, correct?

Re: Do single weight oils have a place? [Re: Mad_Hatter] #5282588 12/02/19 06:40 AM
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RDY4WAR Offline
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Originally Posted by Mad_Hatter
Originally Posted by sloinker
Air compressors, turbines, gearboxes......

Add Transformers.

I use to use a straight 30..30+ years ago while living in the valley of SoCal. But living up north like I do now, a multi grade is the way to go. I can just stock one lube, a 5w30, and be good year round.

Plus today's engines run hotter and rev higher, so I think the high VI of multi grades are a better fit overall???


Don't mistake a high VI to mean thermally stable and shear stable. Polyol ester, for example, has great thermal stability at 300+°F, but has a VI of just 70-80. Most straight 30, 40, and 50 grade oils are going to be more thermally stable because they don't contain viscosity modifiers. Same goes for synthetics that can achieve a multi-grade without VII.

Does any of this really matter for a daily commuter that rarely (if ever) sees over 250°F oil temps and 5000+ rpm? Nope.

Last edited by RDY4WAR; 12/02/19 06:48 AM.

"He who is without oil, shall throw the first rod." - Compressions 9:1
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