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SAE 30 vs. 20W-50 for a short OCI #4805959
07/05/18 02:50 PM
07/05/18 02:50 PM
Joined: Nov 2015
Posts: 814
US
bunnspecial Offline OP
bunnspecial  Offline OP
Joined: Nov 2015
Posts: 814
US
I need to do a quicky oil change in the MG. I'll be doing some engine work in September, so will be draining again then and consequently want to put the cheapest stuff that will actually be safe in there.

With temperatures as hot as they are now, and as hot as they usually stay through September in Kentucky, I'm thinking about dumping in SAE 30 or SAE40 rather than the normal 20W-50.

Any thoughts on doing that? Of course, I can just toss Supertech 20W-50 in it, but if a straight weight will give me as good if not better protection in 80ļ+ ambient temperatures, I'll do it.


2010 Lincoln MKZ-Mobil 1 5W-30
1970 MG MGB Roadster-Valvoline VR-1 20W-50
Re: SAE 30 vs. 20W-50 for a short OCI [Re: bunnspecial] #4805967
07/05/18 02:58 PM
07/05/18 02:58 PM
Joined: Jun 2003
Posts: 2,695
BC, Canada
userfriendly Offline
userfriendly  Offline
Joined: Jun 2003
Posts: 2,695
BC, Canada
Delo 400 SAE40. Nothing better in the heat.

Re: SAE 30 vs. 20W-50 for a short OCI [Re: bunnspecial] #4805968
07/05/18 02:59 PM
07/05/18 02:59 PM
Joined: Oct 2005
Posts: 11,365
PA
d00df00d Offline
d00df00d  Offline
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Posts: 11,365
PA
If the car normally wants 20W-50, I can't imagine it'd do better on SAE 30 or SAE 40.

Is 20W-50 what the car calls for?


2011 Mazda RX-8 R3
Mobil Super 5w-20
Re: SAE 30 vs. 20W-50 for a short OCI [Re: d00df00d] #4805973
07/05/18 03:01 PM
07/05/18 03:01 PM
Joined: Nov 2015
Posts: 814
US
bunnspecial Offline OP
bunnspecial  Offline OP
Joined: Nov 2015
Posts: 814
US
Originally Posted By: d00df00d
If the car normally wants 20W-50, I can't imagine it'd do better on SAE 30 or SAE 40.

Is 20W-50 what the car calls for?


Yes, 20W-50 is the specified grade, with SAE 30 listed as an alternate.


2010 Lincoln MKZ-Mobil 1 5W-30
1970 MG MGB Roadster-Valvoline VR-1 20W-50
Re: SAE 30 vs. 20W-50 for a short OCI [Re: bunnspecial] #4805992
07/05/18 03:33 PM
07/05/18 03:33 PM
Joined: Oct 2005
Posts: 11,365
PA
d00df00d Offline
d00df00d  Offline
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Originally Posted By: bunnspecial
Originally Posted By: d00df00d
If the car normally wants 20W-50, I can't imagine it'd do better on SAE 30 or SAE 40.

Is 20W-50 what the car calls for?


Yes, 20W-50 is the specified grade, with SAE 30 listed as an alternate.

Ah, alright. In that case, I'm inclined to think it'd be okay to run SAE 30 or SAE 40 if you want, and just take it easy on hot days until you can change the oil again.


2011 Mazda RX-8 R3
Mobil Super 5w-20
Re: SAE 30 vs. 20W-50 for a short OCI [Re: bunnspecial] #4806022
07/05/18 04:11 PM
07/05/18 04:11 PM
Joined: Sep 2008
Posts: 3,894
Southeast Texas
gfh77665 Offline
gfh77665  Offline
Joined: Sep 2008
Posts: 3,894
Southeast Texas
Either would be a great choice. If I had to choose I would use the SAE 30 or 40.

Why? Any monograde would have less modifiers than any multi grade. More "pure" in a manner of speaking, and thats benefical if the modifiers are not needed.

Re: SAE 30 vs. 20W-50 for a short OCI [Re: bunnspecial] #4806030
07/05/18 04:21 PM
07/05/18 04:21 PM
Joined: Oct 2004
Posts: 7,988
Cincinnati, OH, USA
bullwinkle Online confused
bullwinkle  Online Confused
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Posts: 7,988
Cincinnati, OH, USA
As hot as it's been lately, 50 or 60 would be fine. Although we might make it below 60F this weekend.


06 Ram 3500 CTD 4X4(FG Venturi), 93 GMC C3500 6.2, 89 F-450 7.3, 98 XJ 4.0(XG8A), 05 xB(XG3600), 18 Transit 3.7, 03 Merc Grand Marquis 4.6 2V(XG2)
Re: SAE 30 vs. 20W-50 for a short OCI [Re: bunnspecial] #4806039
07/05/18 04:40 PM
07/05/18 04:40 PM
Joined: Dec 2002
Posts: 40,910
'Stralia
Shannow Offline
Shannow  Offline
Joined: Dec 2002
Posts: 40,910
'Stralia
Per Doug Hillary, the 20W50 was developed for the shared gearboxes in the Mini and later derivatives, resisting the shear that these experienced, not necessarily because the engine proper needed 20W50.

It then became the "standard".

SAE30 would be fine, as long as it's a decent additive package (i.e. not any of those on the PQIA website) HTHS over 3.5 is sufficiently ample.

Re: SAE 30 vs. 20W-50 for a short OCI [Re: Shannow] #4806381
07/06/18 12:10 AM
07/06/18 12:10 AM
Joined: May 2012
Posts: 953
Rio Rancho, NM
Pajero Offline
Pajero  Offline
Joined: May 2012
Posts: 953
Rio Rancho, NM
Australians certainly know about heat!



Respectfully,

Pajero!


Always remember "Planned obsolescence."

1994 Montero SR 3.5 DOHC, 133,xxx
Fram Ultra/ Snorkel with Pre-filter
K-9-Co-pilot
Re: SAE 30 vs. 20W-50 for a short OCI [Re: bunnspecial] #4806394
07/06/18 12:57 AM
07/06/18 12:57 AM
Joined: May 2009
Posts: 5,417
Canada
expat Offline
expat  Offline
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Posts: 5,417
Canada
Many 'B' owners run with one of the big three 15w-40's.

North American cars did come with an oil cooler as OE.

How is your oil pressure?

Re: SAE 30 vs. 20W-50 for a short OCI [Re: bunnspecial] #4806406
07/06/18 02:14 AM
07/06/18 02:14 AM
Joined: Dec 2017
Posts: 2,346
SE British Columbia, Canada
Snagglefoot Offline
Snagglefoot  Offline
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Posts: 2,346
SE British Columbia, Canada
No major city in Australia is hotter than Houston Texas. The hottest city in Australia is Darwin, where it is almost 90 degrees year round but rarely hits 100 degrees. Sydney rarely gets above 90 degrees. I guess consistently hot is one way of measuring hot weather, and maximum temperature is another. source : Weatherspark.com

You want hot? Itís 112 F in Phoenix tommorow. banana

Last edited by Snagglefoot; 07/06/18 02:22 AM.

If you want the job done right......do it yourself.
Re: SAE 30 vs. 20W-50 for a short OCI [Re: expat] #4806418
07/06/18 03:17 AM
07/06/18 03:17 AM
Joined: Jul 2003
Posts: 4,755
New Zealand
Silk Offline
Silk  Offline
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Posts: 4,755
New Zealand
Originally Posted By: expat
North American cars did come with an oil cooler as OE.


The MGB had an oil cooler in New Zealand too...the B Series engine in the rest of the BMC range didn't. The MGB is hardly more stressed out in normal use than a Morris Oxford.


1987 BMW R65 - Penrite V Twin 20/50
2005 Nissan Expert - Gulf Western 10W-40
1996 Volvo T5 - Penrite HPR15 - 15W-60. Ryco syntec filter.
Re: SAE 30 vs. 20W-50 for a short OCI [Re: Shannow] #4806434
07/06/18 05:27 AM
07/06/18 05:27 AM
Joined: Feb 2015
Posts: 2,202
Slovenia EU
Kamele0N Offline
Kamele0N  Offline
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Posts: 2,202
Slovenia EU
Originally Posted By: Shannow
Per Doug Hillary, the 20W50 was developed for the shared gearboxes in the Mini and later derivatives, resisting the shear that these experienced, not necessarily because the engine proper needed 20W50.

It then became the "standard".

SAE30 would be fine, as long as it's a decent additive package (i.e. not any of those on the PQIA website) HTHS over 3.5 is sufficiently ample.


Nowadays 20w50 (as I was told cca 3weeks ago in another thread) are pretty weak sauces compared to 70's - 90's 20w50...

So what do you suggest? API SG (of "that" era) had peak ZDDP levels...but is "castrated" nowadays...

API SL?

My pick (because of the shared sump) would be any full saps Rimula/Rotella HDEO (JASO MA) or any Tractor STOU oil with GL4 rating...

20w50 or no 20w50...well I am not a Yenkee and therefore I am not burdensome about/with an proper oil weight smile If it shifts ok with 10w40 or 10w30...I will use that...


2011 Hyundai i30 1.4 CVVT Shell Helix Ultra 5w40
1997 Toyota Landcruiser KZJ95 3.0 TD Shell Rimula R6M 10w40
Re: SAE 30 vs. 20W-50 for a short OCI [Re: bunnspecial] #4806441
07/06/18 05:53 AM
07/06/18 05:53 AM
Joined: Jul 2003
Posts: 4,755
New Zealand
Silk Offline
Silk  Offline
Joined: Jul 2003
Posts: 4,755
New Zealand
I wouldn't call an A3/B4 20W-50 weak in any way...but may not be on the shelf in the US.


1987 BMW R65 - Penrite V Twin 20/50
2005 Nissan Expert - Gulf Western 10W-40
1996 Volvo T5 - Penrite HPR15 - 15W-60. Ryco syntec filter.
Re: SAE 30 vs. 20W-50 for a short OCI [Re: Snagglefoot] #4806451
07/06/18 06:12 AM
07/06/18 06:12 AM
Joined: Sep 2013
Posts: 10,457
Indiana
dlundblad Offline
dlundblad  Offline
Joined: Sep 2013
Posts: 10,457
Indiana
Originally Posted By: Snagglefoot
No major city in Australia is hotter than Houston Texas. The hottest city in Australia is Darwin, where it is almost 90 degrees year round but rarely hits 100 degrees. Sydney rarely gets above 90 degrees. I guess consistently hot is one way of measuring hot weather, and maximum temperature is another. source : Weatherspark.com

You want hot? Itís 112 F in Phoenix tommorow. banana


I've said this many many times on BITOG and just gave up. It's about as bad as the claim that 0w30 in a snow blower at 30*F is noticeably easier to pull start...

"I use *insert stout non-available to US oil here*_________ because of the heat." No, you use it because there's no CAFE laws and as a result, the oils sold there don't have to be energy conserving. Look at the owners manual for a car in the US and compare it to the owners manual for the same engine in Australia.

That said, if the climate allows for it, there's no reason not to run a thicker oil IMO, but the "heat" certainly isn't the correct reason. HDEO giving one the warm fuzzies would be more of a correct answer. laugh

Last edited by dlundblad; 07/06/18 06:14 AM.

03 Jeep WJ 4.0 200k Castrol Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 177k M1 0w40 Mahle OX149D
97 Chevy Blazer 4.3 149k Rotella T5 10w30 Supertech ST3980

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