what is the best oil for FI apps, honest opinions

[old motorhead]

Originally Posted by ipimpthisc

i know from just common chemistry that the thinner oils are better...its the temp degradation that determines the point where an oil loses its protection...Obviously syns are much better in general...I just want the best all around brand. Old motor head i suppose u where being sarcastic. I like humor but i am asking for serious opinions..if u want to go bash what some one stated or me for just agreeing on here do so after u have valuable input.

Yes, I was being sarcastic to make a point. The folks that built the motor did so with very specific clearances. Different thicknesses of lubricants flow through those clearances at different rates. The fact that your motor has a supercharger on top, front, or side does not change how the motor was set up. I use what the folks that built the motor tell me to use.

The only time I go with a heavier oil is when the motor has big miles. Several or my GM trucks are now run on 15w40 oil after 200K miles. No way would I run a heavier oil on a newer motor. Even in our lovely 100+ degree heat. My daily driver GMC is supercharged with a forged motor. The guy that did the machine work and set up the clearances recommended 15w50. Guess what I run in that one. The well established synthetics are all pretty good in my book. I'd pick one that's readily available and you're comfortable with and run it at the recommended weight.

[2010 SS RS]

I was having a similar conversation the other day with a friend of mine that just got a 427. Winter driving is not an issue so the basis of my suggestion was for regular mild to warm temp driving. I explained that I balanced out my oil with consumption. What I ended up with was 10 w 40. 5w30 would go away very quickly to the tune of 1 qt in 750 miles but a slightly thicker oil did not. My theory is that it was related to ring and swipe ability and oil return thru the pistons. Also a thinner oil would not sustain oil pressure as high once engine was hot. Thicker oil will lower your HP, So you obviosly want to run as thin as you can but balance it with the fore mentioned issues.

Amsoil is clearly the best in testing but hard to find. Royal Purple performs well but can cause cat damage unless you find and use the high zinc mixture available. Schaffers is also a very high quallity oil that resists breakdown but like amsoil is hard to find. Mobil 1 sold out and has gone cheaper in order to get in the door at KMarts and is not what it used to be in my opinion.

Cut oldmotorhead a little slack.. He was being himself and I am sure was chuckling when he wrote it as did I when I read it..

Congrats on the build.. Extreme permagrin is a good thing.

Oh and a disclaimer.. because you were not specific. If you have a oil line to a centrifical blower then you need to defer to manufacturer suggested oil for them.. Some use oil from your pan for lubrication as opposed to self contained.

[ipimpthisc]

Originally Posted by old motorhead

Yes, I was being sarcastic to make a point. The folks that built the motor did so with very specific clearances. Different thicknesses of lubricants flow through those clearances at different rates. The fact that your motor has a supercharger on top, front, or side does not change how the motor was set up. I use what the folks that built the motor tell me to use.

The only time I go with a heavier oil is when the motor has big miles. Several or my GM trucks are now run on 15w40 oil after 200K miles. No way would I run a heavier oil on a newer motor. Even in our lovely 100+ degree heat. My daily driver GMC is supercharged with a forged motor. The guy that did the machine work and set up the clearances recommended 15w50. Guess what I run in that one. The well established synthetics are all pretty good in my book. I'd pick one that's readily available and you're comfortable with and run it at the recommended weight.

well guess what i pretty much agree with u...but i wanted to know what u, and every1 else thinks is the "best" syn. This is pretty much conjecture, but are some oil companies that have done some type of tests. But thank you for the input.

[ipimpthisc]

Originally Posted by 2010 SS RS

I was having a similar conversation the other day with a friend of mine that just got a 427. Winter driving is not an issue so the basis of my suggestion was for regular mild to warm temp driving. I explained that I balanced out my oil with consumption. What I ended up with was 10 w 40. 5w30 would go away very quickly to the tune of 1 qt in 750 miles but a slightly thicker oil did not. My theory is that it was related to ring and swipe ability and oil return thru the pistons. Also a thinner oil would not sustain oil pressure as high once engine was hot. Thicker oil will lower your HP, So you obviosly want to run as thin as you can but balance it with the fore mentioned issues.

Amsoil is clearly the best in testing but hard to find. Royal Purple performs well but can cause cat damage unless you find and use the high zinc mixture available. Schaffers is also a very high quallity oil that resists breakdown but like amsoil is hard to find. Mobil 1 sold out and has gone cheaper in order to get in the door at KMarts and is not what it used to be in my opinion.

Cut oldmotorhead a little slack.. He was being himself and I am sure was chuckling when he wrote it as did I when I read it..

Congrats on the build.. Extreme permagrin is a good thing.

Oh and a disclaimer.. because you were not specific. If you have a oil line to a centrifical blower then you need to defer to manufacturer suggested oil for them.. Some use oil from your pan for lubrication as opposed to self contained.

as i did with motorhead i agree with u as well...these are good theoretical points...seems imma go amsoil...

[S-eatin-grin]

Mobile 1 10w30...that's what Ted at JRE told me to put in it so that's what I'm gonna do!

[ipimpthisc]

Originally Posted by S-eatin-grin

Mobile 1 10w30...that's what Ted at JRE told me to put in it so that's what I'm gonna do!

well ted is a learned man, and well respected

[alssiri]

What about 15w40 it is the only Royal Purple wieght that i can find overhere ?
usualy using 20w50

Ahmad

[ipimpthisc]

Originally Posted by alssiri

What about 15w40 it is the only Royal Purple wieght that i can find overhere ?
usualy using 20w50

Ahmad

well Dubai is extremely hot...i suppose 20w oil is good over there...but its the desert. doesn it get really cold at night as well.....personally for newer cars i would stay away from a 20w totally. Unless u are really pushing very hot turbos or SC units..maybe then i can say that would be ok...but I wont go past a 10w oil...i would suggest u look at amsoil web site ..they really break stuff down. For a long time they have my respect. But if any ones dares them...i am all ears


ps : I have also hearsd and red many bad things about RP ....I would stay away from them.....I am no expert but I listen to folks. The next best thing besides amsoil seems to be redline then mobil1

[alssiri]

It gets realy hot overhere +40C in summer & the lowest in winter is 10C maybe for 3 months only,we have a long hot season & a short cold weather season.

Ahmad

Originally Posted by ipimpthisc

well Dubai is extremely hot...i suppose 20w oil is good over there...but its the desert. doesn it get really cold at night as well.....personally for newer cars i would stay away from a 20w totally. Unless u are really pushing very hot turbos or SC units..maybe then i can say that would be ok...but I wont go past a 10w oil...i would suggest u look at amsoil web site ..they really break stuff down. For a long time they have my respect. But if any ones dares them...i am all ears


ps : I have also hearsd and red many bad things about RP ....I would stay away from them.....I am no expert but I listen to folks. The next best thing besides amsoil seems to be redline then mobil1

[ipimpthisc]

well then are good i suppose...there are so many variables. But i look at it like this. Run the least viscous oil for the job, from the best oil brand. this is my quest....

[UNRIVALED SS]

I have always used Mobile 1. There are a few companies out there producing some products that are superior. However, there is not enough improvement to make it worth the time, effort and additional expense to use their product regularly as it pertains to driving often on the street or having considerable miles put on the vehicle per year.

The thing about the viscosity of oil. If you really want to understand the need for oil, as well as, adequate fuel flow. Take the time to learn a little about general hydrolics. Flow is inversely related to preasure. So, those that see more oil preasure have a false sense that the engine is receiving better lubrication, as seen with thicker oils, when it could be the opposite. Old Motorhead has it right. What you need is volume and flow, between the fricton surfaces and this is best accomplished with a lighter viscosity lubricant. The clearance in a GM built engine is the same regardless, within a certain tolerance, therefore the oil flow requirement is the same. Best acheived with 5W30. If GM, in all their testing and hours of RD recommend it. It`s probobly a good bet not to try and out smart them. As for aftermarket engine buiders. Know one knows the clearance better than the guy who checks it five times over and over. Most nitrous and FI engines have additional clearance, therefore there is room for more and perhaps thicker oil to achaieve greater surface tension between the friction surfaces.

Opinion officially expressed. Now, drive it hard and break it. You`ll have more fun that way. Change the oil and don`t worry about it. It`ll be the most fun in the world!

[LittleMT]

Out of curiousity, does anybody know what weight of oil GM recommends for the LSA/LS9 engine?

[ipimpthisc]

Originally Posted by UNRIVALED SS

I have always used Mobile 1. There are a few companies out there producing some products that are superior. However, there is not enough improvement to make it worth the time, effort and additional expense to use their product regularly as it pertains to driving often on the street or having considerable miles put on the vehicle per year.

The thing about the viscosity of oil. If you really want to understand the need for oil, as well as, adequate fuel flow. Take the time to learn a little about general hydrolics. Flow is inversely related to preasure. So, those that see more oil preasure have a false sense that the engine is receiving better lubrication, as seen with thicker oils, when it could be the opposite. Old Motorhead has it right. What you need is volume and flow, between the fricton surfaces and this is best accomplished with a lighter viscosity lubricant. The clearance in a GM built engine is the same regardless, within a certain tolerance, therefore the oil flow requirement is the same. Best acheived with 5W30. If GM, in all their testing and hours of RD recommend it. It`s probobly a good bet not to try and out smart them. As for aftermarket engine buiders. Know one knows the clearance better than the guy who checks it five times over and over. Most nitrous and FI engines have additional clearance, therefore there is room for more and perhaps thicker oil to achaieve greater surface tension between the friction surfaces.

Opinion officially expressed. Now, drive it hard and break it. You`ll have more fun that way. Change the oil and don`t worry about it. It`ll be the most fun in the world!

I love this !! excellent point, the flow dynamics of all fluids is still from the law of p1 v1 t1...blah the rest u know... So indeed there must be a balance between pressure , volume, and then the temp as they are all interconnected. And I have to say >>$$$$$ means a lot our realistic equation. Now "unrivaled SS" go get a dyno,, sum lab equipment, and keep us posted

[ADM PERFORMANCE]

Originally Posted by LittleMT

Out of curiousity, does anybody know what weight of oil GM recommends for the LSA/LS9 engine?

GM Uses 5-30 in almost all their engines.

Every engine that has had my hands on it leaves running 15w-50 in it,I started this 9 years ago when John Lingenfelter told me that is what they
put in all their builds.