Oil Weight
06-28-2007, 09:58 PM
#12
4th Gear Member
Join Date: Aug 2006
Location: IL
Posts: 1,598
RE: Oil Weight
You may have to see what the specs are on your new motor. I run the recommended 5-50 SYNTEC in my Extreme.....supercharged motors are running lower compression and sometimes you can get away with a little heavieroil. Although, 5-30 synthetic is probably what they recommend in the SC Roush's.
There is a lot of truth in what everyone is saying though......when in doubt, follow factory recommendations
!
Keep in mind.....oil weight represents the properties of the oil at running temps. Oil actually gets thicker when it warms up if it was sitting at room temp.(of course....different story sitting in the pan outside ona cold OH winter day
).
There is a lot of truth in what everyone is saying though......when in doubt, follow factory recommendations
! Keep in mind.....oil weight represents the properties of the oil at running temps. Oil actually gets thicker when it warms up if it was sitting at room temp.(of course....different story sitting in the pan outside ona cold OH winter day
).
06-28-2007, 10:09 PM
#13
Banned
Join Date: Jan 2007
Posts: 956
RE: Oil Weight
GidyupGo
A side effect of running 5-20 oil is a very little better gas mileage, Although I don't know who said anything about gas mileage, You are correct, It's not about gas mileage.
My daughters 6 and my wife’s 6 both use 5-20 according to their owners manual.
svfetter
No one is ever to old to learn. I have built many cars back in the 70-80s that the clearances were not so tight, And it was good to run Valvoline 20-50 racing oil. But No longer, Not in the 4.6, after you get 100,000 miles on it then a 10-30 is most likely ok. I still have a qt of that stuff and a spout in the garage.
mills281e
Does Steve rebuild the motors before he sells them to the public? If so that would account for the thicker oil. Most likely looser tolerences because of the crank pressure. I don't think it would be a wise thing to run a SC , 10 psi + motor at 1 thousands clearence. Unless you want spun bearings. Your motor more than likely has a High volume oil pump with 2-3 thousands clearence in the bearings, I would be courious to know the end gap of the rings.
A side effect of running 5-20 oil is a very little better gas mileage, Although I don't know who said anything about gas mileage, You are correct, It's not about gas mileage.
My daughters 6 and my wife’s 6 both use 5-20 according to their owners manual.
svfetter
No one is ever to old to learn. I have built many cars back in the 70-80s that the clearances were not so tight, And it was good to run Valvoline 20-50 racing oil. But No longer, Not in the 4.6, after you get 100,000 miles on it then a 10-30 is most likely ok. I still have a qt of that stuff and a spout in the garage.
mills281e
Does Steve rebuild the motors before he sells them to the public? If so that would account for the thicker oil. Most likely looser tolerences because of the crank pressure. I don't think it would be a wise thing to run a SC , 10 psi + motor at 1 thousands clearence. Unless you want spun bearings. Your motor more than likely has a High volume oil pump with 2-3 thousands clearence in the bearings, I would be courious to know the end gap of the rings.
06-28-2007, 10:58 PM
#14
4th Gear Member
Join Date: Aug 2006
Location: IL
Posts: 1,598
RE: Oil Weight
Does Steve rebuild the motors before he sells them to the public? If so that would account for the thicker oil. Most likely looser tolerences because of the crank pressure. I don't think it would be a wise thing to run a SC , 10 psi + motor at 1 thousands clearence. Unless you want spun bearings. Your motor more than likely has a High volume oil pump with 2-3 thousands clearence in the bearings, I would be courious to know the end gap of the rings.
The most I've seen going through a Series V supercharger is 18 pounds of boost (pulley size: < 3.0"). I'm currently at right around 14 pounds with a 3.5" pulley.
06-29-2007, 11:05 AM
#15
5th Gear Member
Join Date: Apr 2007
Location: The High Country
Posts: 3,547
RE: Oil Weight
ORIGINAL: ZZmustang
GidyupGo
A side effect of running 5-20 oil is a very little better gas mileage, Although I don't know who said anything about gas mileage, You are correct, It's not about gas mileage.
My daughters 6 and my wife’s 6 both use 5-20 according to their owners manual.
svfetter
No one is ever to old to learn. I have built many cars back in the 70-80s that the clearances were not so tight, And it was good to run Valvoline 20-50 racing oil. But No longer, Not in the 4.6, after you get 100,000 miles on it then a 10-30 is most likely ok. I still have a qt of that stuff and a spout in the garage.
mills281e
Does Steve rebuild the motors before he sells them to the public? If so that would account for the thicker oil. Most likely looser tolerences because of the crank pressure. I don't think it would be a wise thing to run a SC , 10 psi + motor at 1 thousands clearence. Unless you want spun bearings. Your motor more than likely has a High volume oil pump with 2-3 thousands clearence in the bearings, I would be courious to know the end gap of the rings.
GidyupGo
A side effect of running 5-20 oil is a very little better gas mileage, Although I don't know who said anything about gas mileage, You are correct, It's not about gas mileage.
My daughters 6 and my wife’s 6 both use 5-20 according to their owners manual.
svfetter
No one is ever to old to learn. I have built many cars back in the 70-80s that the clearances were not so tight, And it was good to run Valvoline 20-50 racing oil. But No longer, Not in the 4.6, after you get 100,000 miles on it then a 10-30 is most likely ok. I still have a qt of that stuff and a spout in the garage.
mills281e
Does Steve rebuild the motors before he sells them to the public? If so that would account for the thicker oil. Most likely looser tolerences because of the crank pressure. I don't think it would be a wise thing to run a SC , 10 psi + motor at 1 thousands clearence. Unless you want spun bearings. Your motor more than likely has a High volume oil pump with 2-3 thousands clearence in the bearings, I would be courious to know the end gap of the rings.
I read somewhere back that someone was claiming that Ford only said to use 5-20 because of better fuel economy in our GT's. I got out my 2007 owner's manual after all of this and it does say to use 5W30 in a 6er. Maybe they changed something in 2007.
06-29-2007, 01:08 PM
#16
I ♥ Acer
Join Date: May 2007
Location:
Posts: 151
RE: Oil Weight
ORIGINAL: GidyupGo
I read somewhere back that someone was claiming that Ford only said to use 5-20 because of better fuel economy in our GT's. I got out my 2007 owner's manual after all of this and it does say to use 5W30 in a 6er. Maybe they changed something in 2007.
I read somewhere back that someone was claiming that Ford only said to use 5-20 because of better fuel economy in our GT's. I got out my 2007 owner's manual after all of this and it does say to use 5W30 in a 6er. Maybe they changed something in 2007.
It's a CAFE checkbox that is being satisfied by running 5W20. Nothing more. You are not going to see any appreciable difference in power using one or the other.
To the OP, you'd better just use what oil Roush recommends. That is the only s/c aftermarket company that gives you a 3 year/36,000 mile warranty. Don't push your luck.
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