How much thicker is 20-50wt than 15-40wt.

Would there be a noticable improvement in cold start flow???


DH

 

I'm running RedLine 20/50 and haven't noticed any different in startup oil flow, but going to 15/40 for the colder months.

 

Man, thats a thick oil your running there. (20-50)
Why so heavy? Are your clearences loose? Or maybe I'm reading this wrong. Are you running 15-40?

I'm breaking my motor in with 15-40 right now. And my cold start psi is 78-82psi. I couldnt imagine running a heavier oil.

 

I run 5w30. I'm pretty sure it says in the owners manual what oil you should run for where you live and how hot or cold it gets. I dont think you will be able to notice a better flow of oil but it might make your engine last longer.

 

Howie has what is essentially, a race engine, so viscosities that are listed in the owner's manual don't apply.

Howie, if both oils are made by the same manufacturer, the 15W-40 will flow better at startup, but the 20W-50 will have higher temperature protection. How hot does your oil get?

By the way, I saw this on the Mobile web site:

 

Dave

I basically know that I was looking for DATA....like 20% less flow etc.

Thanks for that info on Mobil1 I will have to check out exactly how much ZDDP they are adding. If it is at the same .12 PPM as the Valvoline then I will definately use it instead. Do you have a link for that info????? THANKS


DH

 

M1 15-w50 or Redline 40wt racing oil

I use the M1 15-w50

challenge with 5-w30 is it is too thin at temps above 200*

 

Howie,

Here you go:

http://www.mobil.com/USA-English/Lub...il1_15W-50.asp

Dave

 

Dave, it doesn't say they use ZDDP.

I will request this info on their site and see if I get a response.

Product Description
Mobil 1 15W-50 is the most advanced performance synthetic engine oil designed to provide the cleaning power, wear protection and performance reserve to keep engines running smooth and clean.



Features and Benefits
Mobil 1 15W-50 is formulated with SuperSyn, an extra high-viscosity synthetic fluid, plus extra anti-wear additive to provide extra protection for severe service applications. Mobil 1 15W-50 is recommended for high performance vehicles including turbocharged and supercharged engines where a thicker oil film is desired. Mobil 1 15W-50 is also recommended for older valve train designs that may benefit from a higher level of anti-wear normally not required for newer generation vehicles. Mobil 1 15W-50 will also provide better anti-wear protection for higher valve spring tensions in certain racing engines.

Key features and benefits include:




Features
Advantages and Potential Benefits
Fully synthetic formula with SuperSyn Technology Helps prevent deposits and sludge build-up to enable long engine life Excellent overall lubrication and wear protection performance for all driving styles
Outstanding thermal and oxidation stability Outstanding performance during the maximum oil change interval recommended in a vehicle’s owners manual
Extra anti-wear additive Extra protection for severe service

Applications
Mobil 1 15W-50 is recommended for all types of modern vehicles, including high-performance turbo-charged, supercharged gasoline and diesel multi-valve fuel injected engines found in passenger cars, SUVs, light vans and trucks.

Mobil 1 15W-50 is recommended for older valve train designs that may benefit from a higher level of anti-wear normally not required in newer generation vehicles
Mobil 1 15W-50 is not recommended for 2-Cycle or aviation engines, unless specifically approved by the manufacturer.


Back to Top

Specifications and Approvals

Mobil 1 15W-50 meets or exceeds the following industry specifications:
API SM,SL,SJ,EC,CF


Typical Properties

Mobil 1 15W-50
SAE Grade 15W-50
Viscosity, ASTM D 445
cSt @ 40º C 131.2
cSt @ 100º C 18.1
Viscosity Index, ASTM D 2270 154
Sulfated Ash, wt%, ASTM D 874 1.21
HTHS Viscosity, mPa•s @ 150ºC ASTM D 4683 4.50
Pour Point, ºC, ASTM D 97 -39
Flash Point, ºC, ASTM D 92 235
Density @15º C kg/l, ASTM D 4052 0.87

 

Main feature of the "extra anti-wear additive to provide extra protection for severe service applications. Mobil 1 15W-50 is recommended for high performance vehicles"

and the

HTHS Viscosity, mPa•s @ 150ºC ASTM D 4683 4.50

Or High Temp, High-Sheer rating.

and 22,000 hard 3000, to redline miles. and the oil analysis of minimal break down.

I do change the oil every two events or about 500 miles.

 

I got the email back from Exon-Mobil:

It is ZDDP @ 1300ppm !!!!!!

Going to call as well.......

Will be using it the soon as I get a couple more weeks of dino oil breakin.

Tom.....Have you found a bulk rate anywhere that you could share??


DH

 

I buy my oil at Wally world. 5 quart jugs $22-$25 something. Once in a while PepBoys seems to have coupons for buy 4 qts and get a qt free. or buy two cases of 6 qts get a 3rd case at 50% off

I use the old jugs to measure what I drain out. My whole system holds 10 1/2 qts, but seldom drain more then 9 qts out. then that is what I put back in.

6 qts into the block, turn the engine on and let it circulate, and start to fill the accu-sump. as the level falls on the dip stick, put more in.
Take car for short drive, get the oil pressure up. bring it back and put the ballance back in.

Then after the first track session I check the oil.

The only time I dont like 15-w50 are those frick'n cold Jan track days. Brrrrr. I just close up the raidaotor opening like in NASCAR, but still dont get oil above 180 then.

 

$5.00 or less a quart for M1 is GREAT. Its something like $7.00 at PepBoys the last time I bought it by the quart.

Thanks for the tip.....


DH

***EDIT: Can't find online at Walmart or PepBoy. Are you using the silver cap or gold cap. Do you even know if you buy only in jugs. The new version of Mobil1 15-50 is the silver top I believe (which has the added ZDDP). The gold cap is the extended performance version.

I will be calling tomarrow for more info.

 

please post and let us know!

 

M1 15-w50 Silver Cap and says NEW in red letters on the top part of the lable.

The gold cap was the 'extended' formula. I like the normal or NEW formula better then the Extended formula



I also get the 5-w30 in the 5 qt jugs. For the wifes vette and the pick up.

These jugs are also great for getting rid of used oil too.

The 5 qt jugs are a WalMart Exclusive. I don't remember if I have seen them in Sam's Club or not.

 

I definately want to get these jugs. But I don't see it online at Walmart. I will just have to go by there and see if they have it in the store.

Rusty: I didn't have time to call MOBIL but I'm sure Tom's got the right stuff there.


DH

 

found 'em at walmart 21.95! bought two

 

Thats just a damn great price for what should be a great oil....$4.40/Qt.


DH

 

When Phoenix Performance installed my accu-sump, oil cooler and trans cooler, they told me M1 15-w50 is what they put in and keep using that.

22,000 track miles latter ( new valve springs twice ) - I send my oil to Bob the Oil Guy and a local place to be analyzed every other oil change. SO I have a good record of oil usage and engine ware, which is minimal..

Granted it is an LS6 with a small cam and only 400/400 to the ground. But like a Timex "it takes a licking but keeps on ticking."

Well it was a 2003 LS1, but took off the 241 heads and put 243 heads with a 224/228 581/581 112 comp cam in and keep the tune very conservative. Tuned the car for 3rd gear out of corners vs 4th gear red line dyno bar racing hype

 

Yup best place. I get the M1 5-w30 in 5qt jugs there for the pick-up and wifes vette too.