Recent Topics
My wife is wanting a new car
by MParr
52 minutes 32 seconds ago
Oil choices
by charmer37
Today at 07:22 PM
Lifeguard 8 and Audi 8hp55
by seanf
Today at 06:44 PM
2008 Tahoe loses power - electrical problem
by pacem
Today at 06:36 PM
How to clean wood trim?
by MajorCavalry
Today at 05:39 PM
Rotella T6 5w40 $12.97 after rebate
by dmiko
Today at 04:30 PM
Drivers not turning left with green light
by Mr Nice
Today at 04:25 PM
Someone hit my car
by Dylan1303
Today at 04:15 PM
Which spark plugs for 92 Olds 88?
by atikovi
Today at 02:54 PM
Electronic spark doesn't work on gas stove
by JLawrence08648
Today at 02:46 PM
Doorbell Button Bulb
by Yah-Tah-Hey
Today at 02:07 PM
AC/Blendoor Problem
by SilverFusion2010
Today at 01:53 PM
Suzuki 2.7L idle noise
by FlyPenFly
Today at 01:52 PM
TSC Rotella...YIKES!
by Greg L
Today at 01:48 PM
New Hampshire Speedway
by Warstud
Today at 01:13 PM
Tree growing from stump?
by edwardh1
Today at 01:02 PM
Kingquad hard shifting
by jay929
Today at 10:58 AM
CVT transmissions
by Gito
Today at 10:31 AM
sunday newspaper paper price increase $2 to $3
by edwardh1
Today at 10:08 AM
Tomatos and peppers
by Quattro Pete
Today at 10:02 AM
Newest Members
motogp46, Kyle0651, cavisco, firefox87, wiliweld
65534 Registered Users
Who's Online
87 registered (2015_PSD, AlaskaMike, AnonOIl, 4WD, 77GrandPrix, 7 invisible), 1601 Guests and 29 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
65534 Members
67 Forums
287492 Topics
4795897 Posts

Max Online: 3590 @ 01/24/17 08:07 PM
Donate to BITOG
Page 1 of 2 1 2 >
Topic Options
#4805959 - 07/05/18 02:50 PM SAE 30 vs. 20W-50 for a short OCI
bunnspecial Offline


Registered: 11/23/15
Posts: 784
Loc: 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

Top
#4805967 - 07/05/18 02:58 PM Re: SAE 30 vs. 20W-50 for a short OCI [Re: bunnspecial]
userfriendly Offline


Registered: 06/03/03
Posts: 2653
Loc: LaFinDuMonde
Delo 400 SAE40. Nothing better in the heat.

Top
#4805968 - 07/05/18 02:59 PM Re: SAE 30 vs. 20W-50 for a short OCI [Re: bunnspecial]
d00df00d Online   content


Registered: 10/20/05
Posts: 11285
Loc: 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

Top
#4805973 - 07/05/18 03:01 PM Re: SAE 30 vs. 20W-50 for a short OCI [Re: d00df00d]
bunnspecial Offline


Registered: 11/23/15
Posts: 784
Loc: 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

Top
#4805992 - 07/05/18 03:33 PM Re: SAE 30 vs. 20W-50 for a short OCI [Re: bunnspecial]
d00df00d Online   content


Registered: 10/20/05
Posts: 11285
Loc: PA
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

Top
#4806022 - 07/05/18 04:11 PM Re: SAE 30 vs. 20W-50 for a short OCI [Re: bunnspecial]
gfh77665 Offline


Registered: 09/01/08
Posts: 3825
Loc: 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.

Top
#4806030 - 07/05/18 04:21 PM Re: SAE 30 vs. 20W-50 for a short OCI [Re: bunnspecial]
bullwinkle Online   confused


Registered: 10/09/04
Posts: 7744
Loc: 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), 15 Transit 3.7, 03 Merc Grand Marquis 4.6 2V(XG2)

Top
#4806039 - 07/05/18 04:40 PM Re: SAE 30 vs. 20W-50 for a short OCI [Re: bunnspecial]
Shannow Offline


Registered: 12/12/02
Posts: 40206
Loc: '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.

Top
#4806381 - 07/06/18 12:10 AM Re: SAE 30 vs. 20W-50 for a short OCI [Re: Shannow]
Pajero Offline


Registered: 05/05/12
Posts: 953
Loc: 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

Top
#4806394 - 07/06/18 12:57 AM Re: SAE 30 vs. 20W-50 for a short OCI [Re: bunnspecial]
expat Offline


Registered: 05/12/09
Posts: 5400
Loc: 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?

Top
#4806406 - 07/06/18 02:14 AM Re: SAE 30 vs. 20W-50 for a short OCI [Re: bunnspecial]
Snagglefoot Offline


Registered: 12/31/17
Posts: 1911
Loc: 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


Edited by Snagglefoot (07/06/18 02:22 AM)

Top
#4806418 - 07/06/18 03:17 AM Re: SAE 30 vs. 20W-50 for a short OCI [Re: expat]
Silk Offline


Registered: 07/26/03
Posts: 4623
Loc: 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.

Top
#4806434 - 07/06/18 05:27 AM Re: SAE 30 vs. 20W-50 for a short OCI [Re: Shannow]
Kamele0N Offline


Registered: 02/09/15
Posts: 2106
Loc: 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

Top
#4806441 - 07/06/18 05:53 AM Re: SAE 30 vs. 20W-50 for a short OCI [Re: bunnspecial]
Silk Offline


Registered: 07/26/03
Posts: 4623
Loc: 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.

Top
#4806451 - 07/06/18 06:12 AM Re: SAE 30 vs. 20W-50 for a short OCI [Re: Snagglefoot]
dlundblad Offline


Registered: 09/30/13
Posts: 10212
Loc: 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


Edited by dlundblad (07/06/18 06:14 AM)
_________________________
03 Jeep WJ 4.0 199k 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


Top
Page 1 of 2 1 2 >