Oil - Confused
#21
To be maintaining your car under the "normal" schedule. means you never take short drives, don't live in any hot Southern States, or cold northern territories, or drive fast, or drive in any kind of stop and go traffic, never travel in dust, dirt, sand, mud, mountains, snow.... etc etc....
Any of these acts moves you to the "severe driving conditions" maintenance schedule.
"Normal conditions" refers to "Ideal conditions", and very few cars live that life.
Vince
Any of these acts moves you to the "severe driving conditions" maintenance schedule.
"Normal conditions" refers to "Ideal conditions", and very few cars live that life.
Vince
interesting. I didnt know that. according to Yahoo Auto:
What Is Considered Severe Use?
Severe use involves extensive idling or driving frequently in stop-and-go traffic; operating in cold temperatures below 10 degrees or extreme temperatures above 90 degrees; extreme humidity; repeated short-distance trips of less than five miles; towing a trailer or hauling heavy materials; or using E85 fuel more than 50 percent of the time. If you do drive in any one of these conditions in a typical week, you are driving in severe conditions, and may need to change oil more often.
Since starts and stops is the majority of what I do, I'm definitely not waiting for 15K now.
What Is Considered Severe Use?
Severe use involves extensive idling or driving frequently in stop-and-go traffic; operating in cold temperatures below 10 degrees or extreme temperatures above 90 degrees; extreme humidity; repeated short-distance trips of less than five miles; towing a trailer or hauling heavy materials; or using E85 fuel more than 50 percent of the time. If you do drive in any one of these conditions in a typical week, you are driving in severe conditions, and may need to change oil more often.
Since starts and stops is the majority of what I do, I'm definitely not waiting for 15K now.
#22
Well, except for cold start-up. Most modern engines like oil with a viscosity somewhere between 10 and 14cSt to maintain good flow and pressure - both quite important for lubrication. Common or garden 10W-30s and 10W-40s repsectively have viscosities of around 10-11 and 13-14cSt at 100C, full operating temperature.
The number before the "W" is most useful as an indicator of how much the oil will thicken when cold, and I can tell you now that they are all more-or-less useless during cold-starts, hence the importance of the warm-up routine. By way of illustration, any "10W-" oil will have a viscosity of about 100 cSt at 24C. That's TEN TIMES what the engine wants at operating temperature. See the problem?
But some are rather less useless than others. A 0W-X0 full-synthetic brew is about as good as it gets. An "0W-" oil will thicken to around 40cSt at 24C.
The number before the "W" is most useful as an indicator of how much the oil will thicken when cold, and I can tell you now that they are all more-or-less useless during cold-starts, hence the importance of the warm-up routine. By way of illustration, any "10W-" oil will have a viscosity of about 100 cSt at 24C. That's TEN TIMES what the engine wants at operating temperature. See the problem?
But some are rather less useless than others. A 0W-X0 full-synthetic brew is about as good as it gets. An "0W-" oil will thicken to around 40cSt at 24C.
#23
You know, we all talk about #of miles on an engine as if the engine knows or cares what the wheels do. But I wonder if we are missing an important piece of the puzzle - running time.
Private airplane engines must be serviced every 100 hours to remain airworthy. There's actually a little meter in the cockpit to measure the engine time. They don't go by distance, for obvious reasons. If you assume that an average speed for a car is around 30 mph, which is about an even blend of highway and city driving, that 100 hour milestone would come out to about 3000 miles. Funny how that works.
My XK suggests service at 15000 miles, so one may assume (using my arbitrary 30-mph standard) that they are expecting that to be the equivalent of 500 hours of engine time. But since my average speed, according to my trip computer, is 15 mph (100% in-town), I will hit 500 hours at just 7500 miles.
Private airplane engines must be serviced every 100 hours to remain airworthy. There's actually a little meter in the cockpit to measure the engine time. They don't go by distance, for obvious reasons. If you assume that an average speed for a car is around 30 mph, which is about an even blend of highway and city driving, that 100 hour milestone would come out to about 3000 miles. Funny how that works.
My XK suggests service at 15000 miles, so one may assume (using my arbitrary 30-mph standard) that they are expecting that to be the equivalent of 500 hours of engine time. But since my average speed, according to my trip computer, is 15 mph (100% in-town), I will hit 500 hours at just 7500 miles.
#24
#26
Well, except for cold start-up. Most modern engines like oil with a viscosity somewhere between 10 and 14cSt to maintain good flow and pressure - both quite important for lubrication. Common or garden 10W-30s and 10W-40s repsectively have viscosities of around 10-11 and 13-14cSt at 100C, full operating temperature.
The number before the "W" is most useful as an indicator of how much the oil will thicken when cold, and I can tell you now that they are all more-or-less useless during cold-starts, hence the importance of the warm-up routine. By way of illustration, any "10W-" oil will have a viscosity of about 100 cSt at 24C. That's TEN TIMES what the engine wants at operating temperature. See the problem?
But some are rather less useless than others. A 0W-X0 full-synthetic brew is about as good as it gets. An "0W-" oil will thicken to around 40cSt at 24C.
The number before the "W" is most useful as an indicator of how much the oil will thicken when cold, and I can tell you now that they are all more-or-less useless during cold-starts, hence the importance of the warm-up routine. By way of illustration, any "10W-" oil will have a viscosity of about 100 cSt at 24C. That's TEN TIMES what the engine wants at operating temperature. See the problem?
But some are rather less useless than others. A 0W-X0 full-synthetic brew is about as good as it gets. An "0W-" oil will thicken to around 40cSt at 24C.
Cold engine/oil followed by short drives (abbreviated thermal cycles) is a serious concern. That combo would qualify for severe service in my book.
#27
You know, we all talk about #of miles on an engine as if the engine knows or cares what the wheels do. But I wonder if we are missing an important piece of the puzzle - running time.
Private airplane engines must be serviced every 100 hours to remain airworthy. There's actually a little meter in the cockpit to measure the engine time. They don't go by distance, for obvious reasons. If you assume that an average speed for a car is around 30 mph, which is about an even blend of highway and city driving, that 100 hour milestone would come out to about 3000 miles. Funny how that works.
My XK suggests service at 15000 miles, so one may assume (using my arbitrary 30-mph standard) that they are expecting that to be the equivalent of 500 hours of engine time. But since my average speed, according to my trip computer, is 15 mph (100% in-town), I will hit 500 hours at just 7500 miles.
Private airplane engines must be serviced every 100 hours to remain airworthy. There's actually a little meter in the cockpit to measure the engine time. They don't go by distance, for obvious reasons. If you assume that an average speed for a car is around 30 mph, which is about an even blend of highway and city driving, that 100 hour milestone would come out to about 3000 miles. Funny how that works.
My XK suggests service at 15000 miles, so one may assume (using my arbitrary 30-mph standard) that they are expecting that to be the equivalent of 500 hours of engine time. But since my average speed, according to my trip computer, is 15 mph (100% in-town), I will hit 500 hours at just 7500 miles.
Trying to correlate maintenance requirements is kinda pointless, with all due respect.
#28
Agreed, but changing the oil at more frequent intervals doesn't affect this. If engine damage was being done at cold start, fresh oil would not avoid that, in other words.
Cold engine/oil followed by short drives (abbreviated thermal cycles) is a serious concern. That combo would qualify for severe service in my book.
Cold engine/oil followed by short drives (abbreviated thermal cycles) is a serious concern. That combo would qualify for severe service in my book.
Interestingly, Formula One engines don't bother with multigrade at all. They use a straight 10-weight oil, and avoid the whole cold-start shenanigans by introducing oil and coolant fully at temperature at engine-start. Of course the tolerances in those things are so tight that they're effectively seized when cold, so that's why it takes a half-dozen technicians to start them.
Last edited by jimgoose; 02-22-2013 at 10:01 AM.
#29
How rude. You'd think at least it would say Achtung Bitte! I think the technology for variable oil servicing has drifted down to many of the latest cars and not just the high end stuff we play with.
#30
You know, we all talk about #of miles on an engine as if the engine knows or cares what the wheels do. But I wonder if we are missing an important piece of the puzzle - running time.
Private airplane engines must be serviced every 100 hours to remain airworthy. There's actually a little meter in the cockpit to measure the engine time. They don't go by distance, for obvious reasons. If you assume that an average speed for a car is around 30 mph, which is about an even blend of highway and city driving, that 100 hour milestone would come out to about 3000 miles. Funny how that works.
My XK suggests service at 15000 miles, so one may assume (using my arbitrary 30-mph standard) that they are expecting that to be the equivalent of 500 hours of engine time. But since my average speed, according to my trip computer, is 15 mph (100% in-town), I will hit 500 hours at just 7500 miles.
Private airplane engines must be serviced every 100 hours to remain airworthy. There's actually a little meter in the cockpit to measure the engine time. They don't go by distance, for obvious reasons. If you assume that an average speed for a car is around 30 mph, which is about an even blend of highway and city driving, that 100 hour milestone would come out to about 3000 miles. Funny how that works.
My XK suggests service at 15000 miles, so one may assume (using my arbitrary 30-mph standard) that they are expecting that to be the equivalent of 500 hours of engine time. But since my average speed, according to my trip computer, is 15 mph (100% in-town), I will hit 500 hours at just 7500 miles.
#33
The new handbooks (XJ/XF/XK) have this to say about oil:
V8 Petrol engines:
SAE 5W-20 engine oil meeting Jaguar specification WSS
M2C925-A only.
V6 Petrol engines:
SAE 5W-30 engine oil meeting Jaguar specification WSS
M2C913-C is preferred. Oil meeting ACEA A1/B1 or ACEA
A3/B3 specification may be used.
Diesel engines with Diesel Particulate Filter (DPF):
SAE 5W-30 engine oil meeting Jaguar specification WSS
M2C934-B only.
Diesel engines without Diesel Particulate Filter (DPF):
SAE 5W-30 engine oil meeting Jaguar specification
WSS-M2C913-B or WSS-M2C913-C.
Synthetic is not mentioned, neither ruled in nor ruled out.
V8 Petrol engines:
SAE 5W-20 engine oil meeting Jaguar specification WSS
M2C925-A only.
V6 Petrol engines:
SAE 5W-30 engine oil meeting Jaguar specification WSS
M2C913-C is preferred. Oil meeting ACEA A1/B1 or ACEA
A3/B3 specification may be used.
Diesel engines with Diesel Particulate Filter (DPF):
SAE 5W-30 engine oil meeting Jaguar specification WSS
M2C934-B only.
Diesel engines without Diesel Particulate Filter (DPF):
SAE 5W-30 engine oil meeting Jaguar specification
WSS-M2C913-B or WSS-M2C913-C.
Synthetic is not mentioned, neither ruled in nor ruled out.
#34
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