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#3466164 - 08/27/14 10:07 AM 15w50 and ambient temperature
19jacobob93 Offline


Registered: 02/12/14
Posts: 638
Loc: Gold Coast, QL, Australia
What temperature would a 15w oil start to become dangerously thick?
In another thread i told about taking the plunge from 10w30 to 15w50 to see what effects it has and to see if it fixes a few issues
My question is, would i be able to use it year round? Where i live it only gets to about freezing point a couple of times in a winter and hardly ever much below. I sometimes take roadtrips to the snow where it can get much colder

Would i need to change to 10w40 or would 15w50 still be okay?
_________________________
Car: 2000 Ford Falcon 4.0 SOHC I6 @220,000km
Oil: Valvoline Maxlife 20w50 (10k OCI)
Fuel: 95 unleaded + TCW3

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#3466171 - 08/27/14 10:12 AM Re: 15w50 and ambient temperature [Re: 19jacobob93]
rfeir Offline


Registered: 07/13/11
Posts: 201
Loc: NY
15W is too thick at startup for most applications in even just moderately cool weather. Slow to pump at startup. This can increase motor wear.

A 0W or a 5W is usually a better choice.
_________________________
RPF

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#3466180 - 08/27/14 10:19 AM Re: 15w50 and ambient temperature [Re: 19jacobob93]
jrustles Offline


Registered: 02/24/13
Posts: 2035
Loc: Ontario, Canada
Originally Posted By: 19jacobob93

Would i need to change to 10w40 or would 15w50 still be okay?
'


One has two options in this case:

a) freak out about it being too thick due to an unproportional disparity between casual imagination and reality

b) observe the CCS/MRV viscosities and borderline pumping temperature
_________________________
"No matter how paranoid or conspiracy-minded you are, what the government is actually doing is worse than you imagine" W.Blum

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#3466183 - 08/27/14 10:22 AM Re: 15w50 and ambient temperature [Re: rfeir]
19jacobob93 Offline


Registered: 02/12/14
Posts: 638
Loc: Gold Coast, QL, Australia
I would like to try 5 or 10w50 but they are very expensive
Im thinking maybe run the 15 through summer as it never drops below 20-25c at night (think florida type weather)
If i start to get any noises or adverse effects as we head back into winter ill probably change back to thinner
_________________________
Car: 2000 Ford Falcon 4.0 SOHC I6 @220,000km
Oil: Valvoline Maxlife 20w50 (10k OCI)
Fuel: 95 unleaded + TCW3

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#3466184 - 08/27/14 10:24 AM Re: 15w50 and ambient temperature [Re: 19jacobob93]
19jacobob93 Offline


Registered: 02/12/14
Posts: 638
Loc: Gold Coast, QL, Australia
I'll take a sample in a couple of bottles and put one in the fridge (@4c) and one in the freezer! (@-18c)
That might give me a rough idea of winter visc, and a worse case scenario :p
_________________________
Car: 2000 Ford Falcon 4.0 SOHC I6 @220,000km
Oil: Valvoline Maxlife 20w50 (10k OCI)
Fuel: 95 unleaded + TCW3

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#3466193 - 08/27/14 10:29 AM Re: 15w50 and ambient temperature [Re: 19jacobob93]
Quattro Pete Offline


Registered: 10/30/02
Posts: 29246
Loc: Great Lakes
Is this for your falcon? What does the owner's manual recommend?
_________________________
'02 530i (PPE 5W-40)
'15 Q5 3.0T (Edge 5W-40)

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#3466199 - 08/27/14 10:37 AM Re: 15w50 and ambient temperature [Re: Quattro Pete]
19jacobob93 Offline


Registered: 02/12/14
Posts: 638
Loc: Gold Coast, QL, Australia
Yep!
The manual recommends 10w30 and this is also written on the filler cap but its a very old debate.
In the 1994-1998 model, the one before mine they recommended 15w40 and this had the exact same engine only with a different head gasket and altered ecu.
When the new model was introduced in 1998 they recommended 5w30 as the movement towards thin started, but quickly taxi companies were finding premature engine wear and lifter failure, so Ford issued a statement telling people to change back to 10w30 or 15w40 and this completely stopped the problem

Just seems like these engines hate thin oil, as they were a bit long in the tooth at the time being designed for 15w40 a decade earlier

Mine has always had thicker oil in but i switched to 10w30 last year because thats what it recommends, but all of a sudden all of my lifters are shot!
Cant be a coincidence so back to thick i will go frown
_________________________
Car: 2000 Ford Falcon 4.0 SOHC I6 @220,000km
Oil: Valvoline Maxlife 20w50 (10k OCI)
Fuel: 95 unleaded + TCW3

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#3466201 - 08/27/14 10:38 AM Re: 15w50 and ambient temperature [Re: 19jacobob93]
A_Harman Offline


Registered: 10/01/10
Posts: 5272
Loc: Michigan
15W oils get their low temperature ratings at -25C for MRV and -20C for CCS. You'll be fine at 0C, and even -10C.
_________________________
1985 Z51 Corvette track car
2002 Camaro Z28 LS1/6-speed
2001 Dodge Ram 2500 diesel
1972 GMC 1500 shortbed project truck

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#3466203 - 08/27/14 10:39 AM Re: 15w50 and ambient temperature [Re: 19jacobob93]
Quattro Pete Offline


Registered: 10/30/02
Posts: 29246
Loc: Great Lakes
I'd find a 5w-40 oil and use that all year long.
_________________________
'02 530i (PPE 5W-40)
'15 Q5 3.0T (Edge 5W-40)

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#3466205 - 08/27/14 10:41 AM Re: 15w50 and ambient temperature [Re: 19jacobob93]
bigt61 Offline


Registered: 02/12/13
Posts: 1847
Loc: Virginia
I've used 15W-50 M1 down to about 20F in my big block Suburban w no issues. It always flowed fast for me, I just let it warm up a few minutes before putting it in gear. It definitely flows faster than 20W-50 dino which I've seen people use year round for hundreds of thousands of miles in my area - N Virginia. If you routinely get below 20F, I'd probably use a 0W-40.
_________________________
92 Suburban 2500 7.4L 58k M1_5w30 5yr OCI
99 Olds Aurora 4.0L 91K M1_5w30 5yr OCI
13 Dodge Dart 2.0L 29k PP 0w20 OLM OCI
70 Camaro 5.7L 59k

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#3466215 - 08/27/14 10:47 AM Re: 15w50 and ambient temperature [Re: bigt61]
19jacobob93 Offline


Registered: 02/12/14
Posts: 638
Loc: Gold Coast, QL, Australia
Originally Posted By: bigt61
I've used 15W-50 M1 down to about 20F in my big block Suburban w no issues. It always flowed fast for me, I just let it warm up a few minutes before putting it in gear. It definitely flows faster than 20W-50 dino which I've seen people use year round for hundreds of thousands of miles in my area - N Virginia. If you routinely get below 20F, I'd probably use a 0W-40.


Okay that's comforting news i guess! Tried 20w50 once and it knocked like a Jehova's witness in the mornings so i dropped it straight out.
My dad used 40w70 (please don't kill him) in a mitsubishi v6 before and it ran perfect haha
Yeah won't be getting that cold very often! Maybe once every 2 years if ever so i'm excited to try 15w50 now smile
_________________________
Car: 2000 Ford Falcon 4.0 SOHC I6 @220,000km
Oil: Valvoline Maxlife 20w50 (10k OCI)
Fuel: 95 unleaded + TCW3

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#3466218 - 08/27/14 10:50 AM Re: 15w50 and ambient temperature [Re: bigt61]
19jacobob93 Offline


Registered: 02/12/14
Posts: 638
Loc: Gold Coast, QL, Australia
Also just seen you have a 92 Suburban with a 7.4 and only 57k.
I want it.
_________________________
Car: 2000 Ford Falcon 4.0 SOHC I6 @220,000km
Oil: Valvoline Maxlife 20w50 (10k OCI)
Fuel: 95 unleaded + TCW3

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#3466389 - 08/27/14 01:42 PM Re: 15w50 and ambient temperature [Re: 19jacobob93]
aquariuscsm Online   content


Registered: 12/30/06
Posts: 11869
Loc: South Texas,USA
Run the 15W50 year round,you'll be fine. I started my car on a -2F degree morning (car was even sitting outside ungaraged all night) with Valvoline dino 20W50 in it,and she started right up as soon as I turned the key and purred to life. My car actually specs thicker oils and warns against using thinner oils.
_________________________
1996 Nissan 300ZX 5-speed,Arctic Pearl(#175 of 300)
Syntec 10W40/Fram Ultra
Amsoil MTG(tranny)
Amsoil 80W90 GL5(rear diff)
Mobil 1 ATF
Redline Water Wetter

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#3466420 - 08/27/14 02:19 PM Re: 15w50 and ambient temperature [Re: 19jacobob93]
rfeir Offline


Registered: 07/13/11
Posts: 201
Loc: NY
A 0W-40 is not a thinner oil. At running temps it is a true 40. Only during cold startups is it a 0W and that is not too thin even in Florida. It pumps a lot faster which is a good thing, really. Same goes for a 5W.

Remember the W rating is not the same as the running temperature rating. A common misconception. A 0W at its rated temp is actually thicker than a 40 weight oil at its rated temperature. Different rating scales.
_________________________
RPF

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#3466572 - 08/27/14 04:53 PM Re: 15w50 and ambient temperature [Re: 19jacobob93]
fdcg27 Offline


Registered: 09/25/09
Posts: 10995
Loc: OH
According to the OM of my old BMW, a 15W-50 is fine down to
-20C, which is about -4F.
I doubt that you see that kind of cold where you live.
_________________________
12 Accord LX 36K PP 0W-20
09 Forester 67K PU 5W-30
02 Accord 144K GOil 5W-30
01 Focus ZX3 107K Meijer Syn 5W-20
95 BMW 318iC 150K Defy 10W-40

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