Oil weight and brand?
01-07-2010, 06:17 AM
#22
As I'm sure you know, lt1s are notorious for low oil pressure. My car doesn't get driven in the winter at all and the 25w50 keeps it where I'm comfortable when it's hot. The new motor will make the car almost exclusively a track car but I will check out that website. Thanks
01-07-2010, 04:51 PM
#26
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I am fully aware of which weights to use as I have studied oil for years. FWIW and with all due respect your statement about using 40wt in a stock motor is completely incorrect and anecdotal at best. This has never been proven!The differences between a 30 and 40wt are not huge in most cases, especailly considering shear. Efficiency will be affected in a small way, but premature wear does not go up as you have described in such a short time. And engine builders are not the best sources of lubrication knowledge due to agendas and old school mentalities. They are not tribologists, not even close. Please list facts as this has never been proven in testing. So many variables when looking into lubrication. The largest arguement is can the same rate of wear be had using a 0w-20 as opposed to a 5w-30. Some find it can be done but there is not enough concrete evidence and it only relates to certain applications.And many times the heavier oil wins out. Also consider there are differences between like weight oils one 5w-30 will have a certain HTHS(high temp high shear rating)while the other brand will have a different one. HTHS plays a huge role in wear as you will find if you do your research. There are as you are seeing many variables when looking at oil. This is without looking at varying chemisty used in different motor oils (moly,zddp etc......) We havent even delved into the different oil groups offered and the fact that some synthetics actually satisfy a more broad range of requirments viscosity wise. You have to look at the spec sheet for any given oil and consider if it has the tendency to shear in said engine.....I could go on forever really. I am not trying to be condicending and am not a kid.ha. So dont take it the wrong way. There were many things I believed prior to digging into lubes years ago that I learned were merely old wives tales/urban legend. Now considering the winter or cold number, yes some very very small(usually undetectable) amounts of wear MIGHT be generated with a higher weight rating, but you will not ever see this in your ownership. Many LT-1 guys on BITOG run 10w/15w-40 diesel oil (HDEO) like rotella and get better results than when using a 5w-30. The differences we are discussing can usually be picked up in UOA (used oil analysis) but this is not as realiable as tear down which many like myself have done.
I am merely looking to see what you guys use. I am not looking for a recommendation but understand I may have not been clear with my intentions. Some of the obove info may or may not be review. But I can say without a doubt that running a 40wt in your LT-1 or any motor for the most part will not lead to scoring of the bearings and increased wear in a short amount of time. I actually ran Redline 10w-40 in my LT-1 (stock short block) for near 30k with a blower and it looked great upon tear down, as it should. I am not the end all know all of lubrication.I just want to set the record straight.
I am merely looking to see what you guys use. I am not looking for a recommendation but understand I may have not been clear with my intentions. Some of the obove info may or may not be review. But I can say without a doubt that running a 40wt in your LT-1 or any motor for the most part will not lead to scoring of the bearings and increased wear in a short amount of time. I actually ran Redline 10w-40 in my LT-1 (stock short block) for near 30k with a blower and it looked great upon tear down, as it should. I am not the end all know all of lubrication.I just want to set the record straight.
01-07-2010, 07:24 PM
#31
For this discussion why would it matter??
Except for the coolant path they are very similar engines. an LT-1 would generally have a flat tappet and that would like ZDDP but other than that they are VERY much the same.
Oil pressure does not matter, oil FLOW does, just easier to measure pressure and all we need to watch for is a sudden change in pressure indicating a change in flow.
ZDDP is NOT critical for bearings, bearings the pressure fed bearings are kept apart from the part they support by what amounts to hydroplaning.
ZDDP was important to parts that did not get pressurized oil like flat tappets. How many of you are running flat tappets???
The M1 5w-30 everyone mistakes for wonderful is nothing more than decent in an LT1 or LS1.
The belief that 10w-30 is thicker at operating temp than 5w-30 is proof of no real understanding on the subject.
At one point I saw data on oil recommendations for export LT1s and they got 15w-40, the b-body was very popular in the middleast, before you dismiss that as a hot weather thing, it get plenty cold in the desert at night.
North American oil recommendations are CAFE driven, HonDa and Furd did not go 5w-20 for more protection, they did it because it provided adequate protection and gained them a fraction of a MPG.
If you READ the owner's manual that came with your car you will see 10w-30 approved down to 0F.
Except for the coolant path they are very similar engines. an LT-1 would generally have a flat tappet and that would like ZDDP but other than that they are VERY much the same.
Oil pressure does not matter, oil FLOW does, just easier to measure pressure and all we need to watch for is a sudden change in pressure indicating a change in flow.
ZDDP is NOT critical for bearings, bearings the pressure fed bearings are kept apart from the part they support by what amounts to hydroplaning.
ZDDP was important to parts that did not get pressurized oil like flat tappets. How many of you are running flat tappets???
The M1 5w-30 everyone mistakes for wonderful is nothing more than decent in an LT1 or LS1.
The belief that 10w-30 is thicker at operating temp than 5w-30 is proof of no real understanding on the subject.
At one point I saw data on oil recommendations for export LT1s and they got 15w-40, the b-body was very popular in the middleast, before you dismiss that as a hot weather thing, it get plenty cold in the desert at night.
North American oil recommendations are CAFE driven, HonDa and Furd did not go 5w-20 for more protection, they did it because it provided adequate protection and gained them a fraction of a MPG.
If you READ the owner's manual that came with your car you will see 10w-30 approved down to 0F.
01-07-2010, 07:43 PM
#32
For this discussion why would it matter??
Except for the coolant path they are very similar engines. an LT-1 would generally have a flat tappet and that would like ZDDP but other than that they are VERY much the same.
Oil pressure does not matter, oil FLOW does, just easier to measure pressure and all we need to watch for is a sudden change in pressure indicating a change in flow.
ZDDP is NOT critical for bearings, bearings the pressure fed bearings are kept apart from the part they support by what amounts to hydroplaning.
ZDDP was important to parts that did not get pressurized oil like flat tappets. How many of you are running flat tappets???
The M1 5w-30 everyone mistakes for wonderful is nothing more than decent in an LT1 or LS1.
The belief that 10w-30 is thicker at operating temp than 5w-30 is proof of no real understanding on the subject.
At one point I saw data on oil recommendations for export LT1s and they got 15w-40, the b-body was very popular in the middleast, before you dismiss that as a hot weather thing, it get plenty cold in the desert at night.
North American oil recommendations are CAFE driven, HonDa and Furd did not go 5w-20 for more protection, they did it because it provided adequate protection and gained them a fraction of a MPG.
If you READ the owner's manual that came with your car you will see 10w-30 approved down to 0F.
Except for the coolant path they are very similar engines. an LT-1 would generally have a flat tappet and that would like ZDDP but other than that they are VERY much the same.
Oil pressure does not matter, oil FLOW does, just easier to measure pressure and all we need to watch for is a sudden change in pressure indicating a change in flow.
ZDDP is NOT critical for bearings, bearings the pressure fed bearings are kept apart from the part they support by what amounts to hydroplaning.
ZDDP was important to parts that did not get pressurized oil like flat tappets. How many of you are running flat tappets???
The M1 5w-30 everyone mistakes for wonderful is nothing more than decent in an LT1 or LS1.
The belief that 10w-30 is thicker at operating temp than 5w-30 is proof of no real understanding on the subject.
At one point I saw data on oil recommendations for export LT1s and they got 15w-40, the b-body was very popular in the middleast, before you dismiss that as a hot weather thing, it get plenty cold in the desert at night.
North American oil recommendations are CAFE driven, HonDa and Furd did not go 5w-20 for more protection, they did it because it provided adequate protection and gained them a fraction of a MPG.
If you READ the owner's manual that came with your car you will see 10w-30 approved down to 0F.
The LT1 has some differences when compared to an LT-1 as noted. The guy was just curious and asking a question.
Last edited by 355TurboLT1; 01-07-2010 at 07:49 PM. Reason: spelling
01-07-2010, 07:54 PM
#34
He asked which engine it was. I claified. Never said anything about 10w-30 buddy. The study as I said was from bitog and had nothing to do with CAFE certification thank you. Get your facts straight buddy. Dont make stuff up. I never elaborated on ZDDP. Look at my posts.
01-08-2010, 04:58 AM
#40
He asked which engine it was. I claified. Never said anything about 10w-30 buddy. The study as I said was from bitog and had nothing to do with CAFE certification thank you. Get your facts straight buddy. Dont make stuff up. I never elaborated on ZDDP. Look at my posts.
Again I said my comments were NOT aimed at you. Stop looking for something to get bent out of shape about and you will feel better.
Look at Al 96 Ram Air T/A's post and you will see my comments are directed more at him.
He is advocating switching weights seasonally in a location that is 10w-30 compatible year round. I lived there 17years so I know the weather.
That is besides the fact that I know at one point M1 5w-30 was THICKER at operating temps than their 10w-30.
He is also the one that said 40wt would "score the bearings". The overwhelming majority of us know better.