Shell Rotella 15W40 Motor Oil

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Glorywagon

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Well took the mobil one syn.oil out of the Mark VIII yesterday no more engine knock or chain rattle at start up. Installed Shell Rotella 15W40 Motor Oil . So we will see what happens.
Now all my cars are on the same oil. :)
 
The engine wasn't designed for an oil that thick. May do more harm than good in the long run.

Timing chain rattle is due to tensioner oil leak down, obviously the thicker oil will take longer to drain back, hence less rattle.
 
Ford TSB calls for 5W-20. They even moved away from 30 weight although its okay to run 30 in warmer climates. No clue where Greenbrier is, but unless you are in the severe south I would not recomment it.
 
unity said:
Ford TSB calls for 5W-20. They even moved away from 30 weight although its okay to run 30 in warmer climates. No clue where Greenbrier is, but unless you are in the severe south I would not recomment it.
Click to expand...

Note below sorry
 
rotella is GREAT oil. i run it in all my cars now. dont be alarmed when it gets really dark, its supposed to do that.
 
unity said:
Ford TSB calls for 5W-20. They even moved away from 30 weight although its okay to run 30 in warmer climates. No clue where Greenbrier is, but unless you are in the severe south I would not recomment it.
Click to expand...

5W-20 seems very thin.
 
bryantaylor said:
rotella is GREAT oil. i run it in all my cars now. dont be alarmed when it gets really dark, its supposed to do that.[/QUOTE

I'm gonna leave the Rotella in the car. I run it in my other cars with no problems. My shop says its ok FORD says its ok. sent e mail to Rotella waiting on ans.
There is no rattle on start up after setting 30 hours and that can't be all bad.

So you can all say I TOLD YOU SO.

E MAIL FROM ROTELLA

Danny,
I believe Ford recommends 5W30 for this engine now, but I would not expect a problem with Rotella 15W-40, provided you are not concerned with the low temperature advantages provided by the "5W". If there is a something about that engine that is a problem, we don't know about it.

We do have Rotella Synthetic 5W40 also if you would like to stay with a synthetic.


Thank you for your interest in Shell products.

Regards,

Keith Perry
Technical Information Center

Customer Service: (800) 840-5737
Click to expand...
 
Moes8 said:
dont know about 5w20 but 5w30 has been around a lot longer than this motor
Click to expand...

I never heard anyone using it till I bought a Mark VIII

Here is what Rotella told me when I e mailed them.

Danny,
I believe Ford recommends 5W30 for this engine now, but I would not expect a problem with Rotella 15W-40, provided you are not concerned with the low temperature advantages provided by the "5W". If there is a something about that engine that is a problem, we don't know about it.

We do have Rotella Synthetic 5W40 also if you would like to stay with a synthetic.


Thank you for your interest in Shell products.

Regards,

Keith Perry
Technical Information Center

Customer Service: (800) 840-5737
Technical Support: (800) 231-6950

Website, Shell Lubricants, USA:
http://www.shell.us/home/page/usa/p...lubricants/products/app_msds_products_08.html



-----Original Message-----
From: glorywagon@windstream.net [mailto:glorywagon@windstream.net]
Sent: Wednesday, June 11, 2008 3:17 PM
To: askshell, SLUBE-GSMR/5
Subject: Rotella Ask Our Expert: Gasoline Engines


------------------------------------------------
ROTELLA.com E-mail Form
------------------------------------------------
NAME Danny
E-MAIL ADDRESS glorywagon@windstream.net
SUBJECT Gasoline Engines
COMMENTS
----------------------------------------------
I just changed my oil on my 1995 Lincoln Mark VIII from Mobil one syn. oil to Rotella T 15w 40.
Do you have any problem with the change? I run Rotella T in all my other cars with out any problems. But someone said not to run it in a 1995 Mark VIII that I will burn the engine Up. Thank You Danny
----------------------------------------------
 
The higher viscosity just adds more stress at the bearing surfaces. This maybe a mute point in some cases where an engine has alot of wear on it, but when put into a new or near new there could be premautre bearing failure. The rationale is that the newer engines are now machine to much closer machining tolerances so a lighter viscosity oil is needed to get into those areas. Trying to force a higher visc. in there stresses the oil pump and the bearing shells. I have had big block Fords machined with a lot of bearing clearance (lets engine spin easier = more HP) and using 50 or 60 weight oil was common, because the was a lot of void to fill.
I would not put the heavy Rotella oil in my Modular motors, but that certainly is a free choice you can make. Just my 2 cents
 
just a FYI, i curently have the 15w40 in my turbo miata. it took away any lifter tick i had, and it also gave me higher oil pressure.

its made for turbo deisel workhorses that run for hours on end, the stress from towing loads, and the TON of heat from the oil going through the turbo. i would think that would be much harder on a oil than a N/A street driven gas motor.
 
I would really stick with the 5-w30 or 5-w20 with the modular engine. It is recomended for a reason.
 
BMW uses a 10w60 oil in their M cars. They have small areas where oil needs to pass through. Maybe they upgreaded the oil pumps to handle the stress?
Bentley and Rolls uses Mobil 15w50 oil. I have always understood Ford using 5w20 to get better gas mileage out of their cars do to new EPA standards.
 
5w30

5W30 is the warranty recommended oil, Ford changed to 5W20 for fuel economy reasons. You should not have any problems running thicker oil now but 20K miles down the road when the oil pump takes a dump and the back cam gallery's are oil starved and get torn up well you get the idea. The Mark VIII and Cobra SVT's oil systems where designed to use light weight oils, high pressure high volume and oil channels to keep pressures up at high RPM's. Heavy oils put strain on the pump and do not flow to parts of the engine at low RPM's as easily as light oil.
Never use 20W50 unless the motors been built for it. If your motor has high millage and getting a little loose 10W30 to 10W40 wont ever be a problem.
 
bryantaylor said:
just a FYI, i curently have the 15w40 in my turbo miata. it took away any lifter tick i had, and it also gave me higher oil pressure.

its made for turbo deisel workhorses that run for hours on end, the stress from towing loads, and the TON of heat from the oil going through the turbo. i would think that would be much harder on a oil than a N/A street driven gas motor.
Click to expand...

youre getting higher pressure at the sender but do you know how much oil is actually reaching your bearings and head?


pressure is caused by a restriction to flow.


i would STRONGLY reccomend going back to 5w20 or 5w30. rotella is a great oil but 15w40 is just too thick.
 
Glorywagon said:
provided you are not concerned with the low temperature advantages provided by the "5W". If there is a something about that engine that is a problem, we don't know about it.
----
Click to expand...

the rep left you a "cover his ass statement" right in his message.

the 5W and the 10W oils will "reach critical areas" quicker at low temperatures


IF you dont need the oil to "get there quickly" when the temps are very cold..
then you should be fine.

Myself... 10W is as high as I'm gonna run.
My previous 360,000 mile 4.6 still had crosshatch in the cylinder walls when the secondary cam chain tensioner failed.

Then again I live in the deep south, we might have a week of freezing temps in a year
 
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