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Which oil are you using?

  • Motorcraft 5W-50 (OEM rec)

    Votes: 136 51.3%
  • Redline 5W-50

    Votes: 20 7.5%
  • Amsoil 5W-50

    Votes: 39 14.7%
  • Castrol 5W-50

    Votes: 14 5.3%
  • Mobile 1 5W-50

    Votes: 23 8.7%
  • 0W-40

    Votes: 21 7.9%
  • Combination of the above

    Votes: 2 0.8%
  • Other

    Votes: 10 3.8%

  • Total voters
    265
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Discussion Starter #1 (Edited)
Okay, every good forum has to have an oil thread. This is it.

As we all know, our RS's require 5W-50. If you go into your local Walmart, Autozone or O'Reilly's auto parts store, you will not find ANY 5W-50 oil. NAPA can order a few. So there must be alternatives.

First, not all oils of the same *advertised* weight are equal. You might have a 0W-40 from one manufacturer that is "thicker" than a 5W-50 from another. So if you want to compare apples to apples you have to look at the oil specifications of viscosity and also HTHS (High Temperature High Shear). Viscosity is measured in centistokes (CsT). The higher the number, the thicker the oil. HTHS is a rating that determines the oil's stability in a high temperature, high stress conditions. The higher number the better.

Here is a list of oils that I could find, and the cheapest prices I could find and US retailers for 5W-50 oils:

Motorcraft synthetic, O'Reilly Auto Parts, $10.19/qt
Castrol Edge synthetic, O'Reilly Auto Parts, $9.19/qt
Mobil 1, Amazon.com, $51.56 for 6 quarts and free shipping ($8.59/qt)
Redline, Redline.com, $51.95/gal (12.99/qt)

Easy alternative:
Shell Rotella T6 5W-40, Walmart, $19.57/gal



This is a list of some popular (and some not so popular in the US) oils and their specifications:

BRANDTYPEcSt @ 40 CcSt @ 100 CHTHS
Motorcraft5W-5013621???
Castrol Edge5W-50114.3618.53.7
Redline5W-5013021.05.0
Mobil 15w-5010817.54.4
Amsoil5w-5012720.34.7
Pennzoil Platinum5w-5010617.84.1
Schaeffer 90005w-4085-8913.50-15.754.5
Motul 300V5w-4080.813.84.51
Motul 300V10w-4089.514.04.2
Motul 300V15w-50128.117.85.33
Redline5w-4097.015.64.4
Redline10w-4093.014.64.7
Mobil 10w-4078.314.03.7
Mobil 15w-4083.014.03.6
Fuchs Titan Supersyn5w-408614.2
Amsoil5w-4079.713.73.7
Amsoil10w-4090.514.64.3
Elf HTX5w-50117.019.34.6
Total Quartz5w-4082.313.6
Shell Rotella T65w-408714.24
Royal Purple5w-4093.715.73.91
Chevron Delo 400LE5w-4088.514.6
*

For what it's worth, based on this data, MY choice is the Redline 5W-40. It has relatively low viscosity when cold (<100), higher viscosity when hot (>15), and a good HTHS (~4.5). Although the 5W-50 oils have great viscosity when hot, they are all just too damned thick to pump at lower temps, and for a daily driver, that's not acceptable to me.

If you have any changes or additions, please PM me and I will update the table.
 

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Wow, 5W-50 is quite pricey. Looking at your info and some looking, I would have to go with Mobil 1 5W-50, looks pretty solid? What do you suggest?
 

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I'll probably go 0W-50 since I live in Texas and is way easier to find and from a good brand (Rotella). It's what I use in my current car.
 

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I'll probably use Mobil 1 5w-50 also. Had good luck with it in the past, I jus won't use their oil filters as they are too restrictive and can cause oil starvation issues (had it happen in my S2000).
 

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I plan to use AMSOIL 5w-50 due to having good luck with it in the past. but at 11.50/qt its not cheap and its a pain in the ass to get locally, but advanced planing makes that a non issue

my local walmart carries synthetic 5w-50 in a few flavors, Mobil 1, penzoil and quakerstate. I'm positive availability is not universal, so gotta go and see for yourself.

TYPICAL TECHNICAL PROPERTIES
AMSOIL Signature Series Synthetic 5W-50 Motor Oil (AMR)
Kinematic Viscosity @ 100°C, cSt (ASTM D445)
20.3
Kinematic Viscosity @ 40°C, cSt (ASTM D445)
127
Viscosity Index (ASTM D2270)
184
CCS Viscosity, cP @ (°C) (ASTM D5293
5052 (-30)
Flash Point °C (°F) (ASTM D92)
230 (446)
Fire Point °C (°F) (ASTM D92)
252 (486)
Pour Point °C (°F) (ASTM D97)
-47 (-53)
NOACK Volatility, % weight loss (g/100g) (ASTM D5800)
7.4
High Temperature/High Shear Viscosity
@ 150°C, 1.0 X 106 s.-1), cP (ASTM D5481)
4.7
Four-Ball Wear Test @ 40 kgf, 75ºC,
1200 rpm, 1 hr, scar diameter, mm (ASTM D4172)
0.35
Total Base Number (ASTM D2896)
12.6
 

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The First Official Oil Thread - 5W-50 and its alternatives

Good thread. I'll consider sticking this so we don't get 200 similar threads.

As far as me, I'm going with RedLine but not sure if I should stick to the recommended 5-50 or go down to 5-40. The 5-50 seems to be perfect for those looking for a alternative to motorcraft. It's very close in property. My biggest concern is that for me, my most common drive is going to be to the office and that's about 2 miles away from me. Not enough to get the car up to full operating temps so oil like 5-50 might not be the best idea. At the same time I would hate to deal with draining the oil and changing every time I want to go to the track. When I track I won't have anything other than the manufacturer recommended thickness.


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Discussion Starter #7
Lymerock, given your geographic location you should consider a lower viscosity oil, especially if you're daily driving in the winter. The Amsoil 5W-50 is pretty darn thick at lower temps, and although it has very good high temp viscosity and HTHS, you can get almost the same performance from the Mobil 1, and save some money in the process. You'll have to be a little more specific on your driving style, distances, and what seasons you'll be driving.
 

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Just to post a small word of caution. We have yet to see if Ford's recommendations for oil in different markets will be different. In the Fiesta ST they are different. Additionally, Motorcraft's oil is API service rating SN. This may be much more important than viscosity. Some of the oils mentioned are not. I think changing to any other oil than the factory recommended may be premature at this time.
 

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I'll be sticking with the 5W-50. I'm not going to risk the different parasitic flow losses with heavier or lighter weight oils. I didn't design the engine, so I'm fairly certain Ford's more qualified to tell me what oil to use :)

Later down the road, if someone finds a healthy alternative, then maybe. But for now, I'll pay to play and get the Castrol or the Mobil 1
 

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I'll be sticking with the 5W-50. I'm not going to risk the different parasitic flow losses with heavier or lighter weight oils. I didn't design the engine, so I'm fairly certain Ford's more qualified to tell me what oil to use :)

Later down the road, if someone finds a healthy alternative, then maybe. But for now, I'll pay to play and get the Castrol or the Mobil 1
If you want to pay to play you should look at Red Line ;)
 

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Lymerock, given your geographic location you should consider a lower viscosity oil, especially if you're daily driving in the winter. The Amsoil 5W-50 is pretty darn thick at lower temps, and although it has very good high temp viscosity and HTHS, you can get almost the same performance from the Mobil 1, and save some money in the process. You'll have to be a little more specific on your driving style, distances, and what seasons you'll be driving.
saying my driving style is severe is an understatement.
my daily commute to work is 1.7 miles. I go home at lunch as well. so 4 1.7 mile trips per day. so change intervals are few and far between :(
sadly its not ideal, but Ive had success with no sludging in my past vehicles using amsoil.
now I am not anti mobil 1, and im a penzoil fan as well, but when I was autocrossing my mazdaspeed3 twice every weekend for 6 months and driving 10k a year to and from events I wanted something that I could trust.
my tow vehicle gets mobil 1

btw, when you say that 5w-50 is thick at cold temps you do realize you just called 5 weight thick :p
 

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Discussion Starter #16 (Edited)
saying my driving style is severe is an understatement.
my daily commute to work is 1.7 miles. I go home at lunch as well. so 4 1.7 mile trips per day. so change intervals are few and far between :(
sadly its not ideal, but Ive had success with no sludging in my past vehicles using amsoil.
now I am not anti mobil 1, and im a penzoil fan as well, but when I was autocrossing my mazdaspeed3 twice every weekend for 6 months and driving 10k a year to and from events I wanted something that I could trust.
my tow vehicle gets mobil 1

btw, when you say that 5w-50 is thick at cold temps you do realize you just called 5 weight thick :p
Yep. I call it "thick" because the viscosity modifiers or whatever you want to call them only work so well. As you raise the HT viscosity, the LT viscosity also goes up. A good straight weight 5W with a high viscosity index (which is a measure of how well the oil maintains its viscosity for a given temperature change) will have a 40°C cSt of 26.7 and a 100°C cSt of 9.46. So as soon as you start changing the oil to a multi-vis that low end viscosity skyrockets.

You can see it from the chart I posted. All the 5W-50's have a 40°C cSt of over 100, whereas the 5W-40's all have 40°C cSt of 78-97. You should see the specs on something like a 5W-20 or 5W-30. The 40°C/100°C cSt on M1 EP 5W-30 for example (what I use on my FoST) is 59.8/10.6.

The perfect 5W-50 would have a 40/100°C of 30/20 but chemistry just doesn't support that yet.
 

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I'm glad someone started this thread. I don't know much about the engineering behind engine oil, but obviously I want to run the best in my RS.

I ran T6 religiously in my old biturbo car, but I think I will run Motorcraft in the RS until someone else's oil reports show something better. Anyone know what dealer cost is on MC 5w50?
 

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As an ex-STi owner, let's hope the RS community doesn't tend down the Subaru path...
Not saying it's appropriate for the RS, but T6 has shown very favorable lab reports on different platforms, including the MEB.
 

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Not saying it's appropriate for the RS, but T6 has shown very favorable lab reports on different platforms, including the MEB.
Is this with the newer formula that has the lower Zn content? I stopped using it in my STi around the same time as they changed the Zn content (supposedly, at least), so I don't have any experience with the newer stuff.

That was also about the time where there were a couple of reports of STi guys having frothing with it. But Subarus are rather picky with oil anyway (read spun bearing/oil pickup failure :) )
 
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