Hello again. I wanna hear everyone opinion about this two grades of oil. Is it 10w-40 better than 10w-30 or is not? Is it protecting hm motors of wear etc.. Is it synt oil thinner than dino in the same category? Also are semi-synth motor oils ate better vs full synth for hm motors(cars 200+k miles)? Every opinion/answer is welcome.....
10w-40 over 10w-30 for cars 200+ k miles?
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Oil of the correct viscosity will protect the engine from wear best. The additives need to be present and performing, so depending on your engine, how you drive and the oil, it may deplete them more rapidly or less rapidly...once they are used up, wear will increase...
Viscosity is viscosity when the oil is at operating temperature...with the same numbers, a syn is not more viscous nor less than blend or mineral oil...the advantage of syn in most applications is the lower viscosity in real cold, so that they flow better on start...but at operating temperature, 30 is 30...40 is 40...
So, is 10W40 better? Well, depends on the motor. My 4 Runner specifies 10W30 for normal use. It recommends 5W30 in a cold climate and 10W40 in a hot climate. If, like my Toyota engine, there are a few miles on it and the pressure is a little low at idle on a really hot summer day, then I would go with the 10W40 (or, in my case, a 5W40, remember 40 is 40 at operating temperature) and in the winter, I drop back to a 5W30 (or a 0W30) ...but, in the case of my Corolla, the 5W30 works great all the time. I suspect 5W30 will still be the right oil at 200+ on that car.
I think most of your questions would be answered in Dr. Haas' really great oil 101 discussion on this site...go to the home page...take the time to read it...
Viscosity is viscosity when the oil is at operating temperature...with the same numbers, a syn is not more viscous nor less than blend or mineral oil...the advantage of syn in most applications is the lower viscosity in real cold, so that they flow better on start...but at operating temperature, 30 is 30...40 is 40...
So, is 10W40 better? Well, depends on the motor. My 4 Runner specifies 10W30 for normal use. It recommends 5W30 in a cold climate and 10W40 in a hot climate. If, like my Toyota engine, there are a few miles on it and the pressure is a little low at idle on a really hot summer day, then I would go with the 10W40 (or, in my case, a 5W40, remember 40 is 40 at operating temperature) and in the winter, I drop back to a 5W30 (or a 0W30) ...but, in the case of my Corolla, the 5W30 works great all the time. I suspect 5W30 will still be the right oil at 200+ on that car.
I think most of your questions would be answered in Dr. Haas' really great oil 101 discussion on this site...go to the home page...take the time to read it...
Some engines do very well on 10W-40. There's a BMW in the UOA section that ran GTX
10W-40 for over 5000 miles and got next to no wear with it. Single digit wear numbers.
10W-40 for over 5000 miles and got next to no wear with it. Single digit wear numbers.
max45 - what engine are you planning to run this in? Or is this a generic question?
For the record, the 4 Runner has 235K on it...so it qualifies as a high-mileage engine...but I don't run HM, just regular synthetic...whatever I've been able to buy on sale...
For the record, the 4 Runner has 235K on it...so it qualifies as a high-mileage engine...but I don't run HM, just regular synthetic...whatever I've been able to buy on sale...
I've been servicing a 2005 Honda Accord 2.4L with 5w30 for the last few years (engine specs 5w20)
During the last OC @ 200K I installed 5w20 for the upcoming winter run... Engine runs fine and I haven't noticed any increase in oil consumption or leakage (a few oil seals leak oil)
I see no point in using heavy oils as an engine ages (if you've kept on top of maintenance)
During the last OC @ 200K I installed 5w20 for the upcoming winter run... Engine runs fine and I haven't noticed any increase in oil consumption or leakage (a few oil seals leak oil)
I see no point in using heavy oils as an engine ages (if you've kept on top of maintenance)
I've had a few engines with lots of miles on them. I've always run the recommended weight in them, and never had a problem.
I once accidentally purchased a case of 10w40 for my 96 RAV4 with high mileage. I lost a couple of mpg so went back to the 10w30. No harm using 10w40 but the benefit is not worth the lost mileage IMO.
PS: I go to 5w30 during very cold winters.
PS: I go to 5w30 during very cold winters.
If it's not a leaker or burner, just run what the oil cap (or owner's manual) specs.....simple as that.
You may find it rough starting an engine that specs 5W-30, that is running a 10W-40 oil during the winter months.
So whether or not the 10W-40 is "better" than a 10W-30....it's hard to say, depends all on the application requirements...
You may find it rough starting an engine that specs 5W-30, that is running a 10W-40 oil during the winter months.
So whether or not the 10W-40 is "better" than a 10W-30....it's hard to say, depends all on the application requirements...
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Here`s the sticker that`s under the hood of all 1990-1996 300ZX`s. I wonder which oil would give the best protection out of the two?
I would only go with a heavier weight oil if the consumption went up.
Guys I know tend to use heavier oils in high mileage engines because they say it helps with wider crankshaft bearing clearances in higher mileage engines. There is one problem with this idea: Not all bearings wear out at the same rate. Some engines are like tin cans with marbles in them at 90,000 miles, some are like new after 200,000 miles.
The Nissan VG engine is the biggest example I know of. VG30 engines easily went 250,000 miles, but many VG33 engines were in terrible shape at 150,000 miles.
The Nissan VG engine is the biggest example I know of. VG30 engines easily went 250,000 miles, but many VG33 engines were in terrible shape at 150,000 miles.
If my owners manual made allowances for 10W-40, I'd sure run it. I like 10W-40.
I checked Kendall gt-1 pdf's. 10w40 has titanium, and better high temp protection. You probably don't need to run it in a passenger car just because it's 200,000 miles old.
But a truck hauling a heavy load at high speeds surely would benefit from running 10w40.
But a truck hauling a heavy load at high speeds surely would benefit from running 10w40.
If you believe the engineers at Nissan actually know anything about their product either the 10W-30 or the 10W-40 spec is A-OK for normal temps over 0 F...
A Texas weekend where it hits -5 F won't trash the engine. Operating in Duluth over the winter would be a case where the 5W-30 would probably be a good choice.
The cars which have 200K+ would probably be well served with a 10W-40, IMHO, as a general rule that this kind of mileage probably warrants the use of a higher viscosity: there is going to be some wear here.
Whether this 10W-30 is "better" than that 10W-40 is going to depend upon what oils we are talking about: I would opine that a 10W-30 full synthetic is usually a better oil than a house brand 10W-40, and that AMSOIL Full Synthetic 10W-40 is a better oil (in this application) than a name brand semi-synthetic 10W-30. They ought to be "better" as they co$t a lot more!
Luckily you can probably use any modern spec 10W-30 or 10W-40 and never see or experience an iota's worth of difference as far as performance or protection are concerned.
I'd buy the best oil (preferably on sale with rebate) as is available.
Cheers!
A Texas weekend where it hits -5 F won't trash the engine. Operating in Duluth over the winter would be a case where the 5W-30 would probably be a good choice.
The cars which have 200K+ would probably be well served with a 10W-40, IMHO, as a general rule that this kind of mileage probably warrants the use of a higher viscosity: there is going to be some wear here.
Whether this 10W-30 is "better" than that 10W-40 is going to depend upon what oils we are talking about: I would opine that a 10W-30 full synthetic is usually a better oil than a house brand 10W-40, and that AMSOIL Full Synthetic 10W-40 is a better oil (in this application) than a name brand semi-synthetic 10W-30. They ought to be "better" as they co$t a lot more!
Luckily you can probably use any modern spec 10W-30 or 10W-40 and never see or experience an iota's worth of difference as far as performance or protection are concerned.
I'd buy the best oil (preferably on sale with rebate) as is available.
Cheers!
Who said engineers made that chart?
those charts are dated and a joke.
If you re not consuming oil, use the 10-30.
those charts are dated and a joke.
If you re not consuming oil, use the 10-30.
Go by consumption. Use the lightest weight specified that doesn't cause too much usage.
Originally Posted By: artificialist
Guys I know tend to use heavier oils in high mileage engines because they say it helps with wider crankshaft bearing clearances in higher mileage engines. There is one problem with this idea: Not all bearings wear out at the same rate. Some engines are like tin cans with marbles in them at 90,000 miles, some are like new after 200,000 miles.
The Nissan VG engine is the biggest example I know of. VG30 engines easily went 250,000 miles, but many VG33 engines were in terrible shape at 150,000 miles.
These must have been the 300ZX engines, then.. which one was the turbo in the 1996, the VG33? What grade of oil is best in these engines? (GC?)
EDIT: NM.. craving a nissan now. http://en.wikipedia.org/wiki/Nissan_VG_engine
What grade of oil for VG30.
Guys I know tend to use heavier oils in high mileage engines because they say it helps with wider crankshaft bearing clearances in higher mileage engines. There is one problem with this idea: Not all bearings wear out at the same rate. Some engines are like tin cans with marbles in them at 90,000 miles, some are like new after 200,000 miles.
The Nissan VG engine is the biggest example I know of. VG30 engines easily went 250,000 miles, but many VG33 engines were in terrible shape at 150,000 miles.
These must have been the 300ZX engines, then.. which one was the turbo in the 1996, the VG33? What grade of oil is best in these engines? (GC?)
EDIT: NM.. craving a nissan now. http://en.wikipedia.org/wiki/Nissan_VG_engine
What grade of oil for VG30.
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Originally Posted By: 45ACP
which one was the turbo in the 1996, the VG33? What grade of oil is best in these engines? (GC?)
EDIT: NM.. craving a nissan now. http://en.wikipedia.org/wiki/Nissan_VG_engine
What grade of oil for VG30.
The 1990-1996 300ZX`s had the VG30DE/TT engines.
which one was the turbo in the 1996, the VG33? What grade of oil is best in these engines? (GC?)
EDIT: NM.. craving a nissan now. http://en.wikipedia.org/wiki/Nissan_VG_engine
What grade of oil for VG30.
The 1990-1996 300ZX`s had the VG30DE/TT engines.
Originally Posted By: 45ACP
Originally Posted By: artificialist
Guys I know tend to use heavier oils in high mileage engines because they say it helps with wider crankshaft bearing clearances in higher mileage engines. There is one problem with this idea: Not all bearings wear out at the same rate. Some engines are like tin cans with marbles in them at 90,000 miles, some are like new after 200,000 miles.
The Nissan VG engine is the biggest example I know of. VG30 engines easily went 250,000 miles, but many VG33 engines were in terrible shape at 150,000 miles.
These must have been the 300ZX engines, then.. which one was the turbo in the 1996, the VG33? What grade of oil is best in these engines? (GC?)
EDIT: NM.. craving a nissan now. http://en.wikipedia.org/wiki/Nissan_VG_engine
What grade of oil for VG30.
Correct. The VG30 was in every Maxima between 1985 and 1992, every V6 truck from 1986 to 1996, every 300ZX from 1984 to 1996, and every Quest up until around 1998.\
Anyway, what I have seen under the hood of most VG30 powered cars, turbo or not is 5w30 when always below freezing, 10w40 when always above freezing.
I would use 10w40. Many reports in the UOA section get better results, even in Nissan engines that called for 5w30 at all temperatures.
Originally Posted By: artificialist
Guys I know tend to use heavier oils in high mileage engines because they say it helps with wider crankshaft bearing clearances in higher mileage engines. There is one problem with this idea: Not all bearings wear out at the same rate. Some engines are like tin cans with marbles in them at 90,000 miles, some are like new after 200,000 miles.
The Nissan VG engine is the biggest example I know of. VG30 engines easily went 250,000 miles, but many VG33 engines were in terrible shape at 150,000 miles.
These must have been the 300ZX engines, then.. which one was the turbo in the 1996, the VG33? What grade of oil is best in these engines? (GC?)
EDIT: NM.. craving a nissan now. http://en.wikipedia.org/wiki/Nissan_VG_engine
What grade of oil for VG30.
Correct. The VG30 was in every Maxima between 1985 and 1992, every V6 truck from 1986 to 1996, every 300ZX from 1984 to 1996, and every Quest up until around 1998.\
Anyway, what I have seen under the hood of most VG30 powered cars, turbo or not is 5w30 when always below freezing, 10w40 when always above freezing.
I would use 10w40. Many reports in the UOA section get better results, even in Nissan engines that called for 5w30 at all temperatures.
Originally Posted By: artificialist
Originally Posted By: 45ACP
Originally Posted By: artificialist
Guys I know tend to use heavier oils in high mileage engines because they say it helps with wider crankshaft bearing clearances in higher mileage engines. There is one problem with this idea: Not all bearings wear out at the same rate. Some engines are like tin cans with marbles in them at 90,000 miles, some are like new after 200,000 miles.
The Nissan VG engine is the biggest example I know of. VG30 engines easily went 250,000 miles, but many VG33 engines were in terrible shape at 150,000 miles.
These must have been the 300ZX engines, then.. which one was the turbo in the 1996, the VG33? What grade of oil is best in these engines? (GC?)
EDIT: NM.. craving a nissan now. http://en.wikipedia.org/wiki/Nissan_VG_engine
What grade of oil for VG30.
Correct. The VG30 was in every Maxima between 1985 and 1992, every V6 truck from 1986 to 1996, every 300ZX from 1984 to 1996, and every Quest up until around 1998.\
Anyway, what I have seen under the hood of most VG30 powered cars, turbo or not is 5w30 when always below freezing, 10w40 when always above freezing.
I would use 10w40. Many reports in the UOA section get better results, even in Nissan engines that called for 5w30 at all temperatures.
Would you use 0W-40 in there? Just a question. I really like the sound of a Twin-Turbo 1990-1996 300ZX.
(Was the twin turbo variant 1996 only? or 1990-1996? Please let me know.) If 0W-40 is ok.....
Originally Posted By: 45ACP
Originally Posted By: artificialist
Guys I know tend to use heavier oils in high mileage engines because they say it helps with wider crankshaft bearing clearances in higher mileage engines. There is one problem with this idea: Not all bearings wear out at the same rate. Some engines are like tin cans with marbles in them at 90,000 miles, some are like new after 200,000 miles.
The Nissan VG engine is the biggest example I know of. VG30 engines easily went 250,000 miles, but many VG33 engines were in terrible shape at 150,000 miles.
These must have been the 300ZX engines, then.. which one was the turbo in the 1996, the VG33? What grade of oil is best in these engines? (GC?)
EDIT: NM.. craving a nissan now. http://en.wikipedia.org/wiki/Nissan_VG_engine
What grade of oil for VG30.
Correct. The VG30 was in every Maxima between 1985 and 1992, every V6 truck from 1986 to 1996, every 300ZX from 1984 to 1996, and every Quest up until around 1998.\
Anyway, what I have seen under the hood of most VG30 powered cars, turbo or not is 5w30 when always below freezing, 10w40 when always above freezing.
I would use 10w40. Many reports in the UOA section get better results, even in Nissan engines that called for 5w30 at all temperatures.
Would you use 0W-40 in there? Just a question. I really like the sound of a Twin-Turbo 1990-1996 300ZX.
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