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Pickups Diesels Diesel Fuel Economy and chips
391 messages, Last post on Oct 28, 2009 at 4:28 AM
You are in the Diesels Forum. Your Host is kcram
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Replying to: wgreen4 (Sep 02, 2006 2:58 pm) There are two good reasons why you idle any turbocharged engine for several minutes after running down the road. Turbochargers spin at incredibly fast speeds of 70K to 100K or even faster. Idling lets the turbocharger spin down and also allows oil to run over the bearing any cool it. Remember that exhaust heat is transferred via the blades/fan to the shaft and bearing(s). In most cases the bearing is oil cooled while in other instances, it is both oil and water cooled. One trick to avoid coking the bearing in the turbocharger is to use a synthetic oil. There are plenty of good ones out there that are readily available. It is difficult if not almost impossible to coke a good quality synthetic motor oil. Do not start using a synthetic oil in your diesel until about 8K to 10K miles. At that point the engine should be broken in. Using a synthetic before that time could prevent the rings from setting up properly.
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Replying to: winter2 (Sep 10, 2006 5:42 pm) Nevertheless I would definitely use full synthetic oil in any turbocharged vehicle and I would let it idle for a short time (about 1 to 2 min) before shutdown after operation at high power. I do this even with naturally aspirated (i.e. non-turbocharged) gasoline engines, say when pulling into a rest stop on the interstate. I have always heard this allows the valves to cool. I even do this with my Honda aircooled engine lawnmower in which I use Mobile1 10W-30. Note also that a few years back Toyota redesigned the heads on some of its premium engines to increase HP and fuel economy, with the undesired result that oil temperature in the redesigned heads increased significantly. There were a large number of engine failures due to overheating of the oil in the head leading to "sludging". Toyota did not require full synthetic oil, and I'm under the impression that all the failures occurred with conventional oil. In about 1998 I switched to Mobile1 in my wife's 1996 Volvo 850 wagon non-turbo, which unfortunately was totalled in 2004 in a rollover. She replaced it with 2004 Volvo V70 non-turbo. After break-in of 4000 miles of short trips, I had the original oil fill changed to Mobile1 10W-30, and have used that since. I have the oil and filter changed at the recommended 7500 mi intervals (no charge from Volvo dealer for first 3 or 4 years or 60kmi or 80kmi), but I must supply the 6 qts of Mobile1. Castrol syntec would be free from the dealer and would probably work perfectly, but I pay the extra $40 for the Mobile1. When the power train warranty is over, I intend to go to 10,000 or even 15,000 mi interval or 1 year with Mobile1 10W-30 extended service oil.
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Replying to: jim314 (Sep 11, 2006 1:47 am) The problem with the Toyota sludging situation was not only a head design issue but also the way blowby gases were circulated through the engine. As I have read, Toyota redesigned the way the blowby gases were circulated. I see you and I agree on the use of synthetic lubricants. I do not use Mobil 1 for a couple of reasons. One of them is political and personnel. The other reason is that their oils generally do poorly on the Noack vaporization tests and end up with double digit losses during the tests. I prefer Amsoil products or RedLine products. Yes, they are more money but they are also better oils with low single digit vaporization losses. Their oils for diesel engines are outstanding and with as much blowby as a diesel produces, the CCV system on my Jeep Liberty CRD is actually quite clean.
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| I am fairly happy to let ya know my new 2006 6.0 ltr F350 crew 4x4 got 21 mpg on the hwy at 110km/ph (66mph) with the tailgate down and everything stock. I have 22,000 km (13,200miles) on the truck and travelled 3 hrs. However I must confess to a slight tailwind less than 10km(6 mph gusts). I love my new truck but what a dog off the line. Still used to gassers but will never go back. | |
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Replying to: pipfindr (Sep 22, 2006 1:33 pm) Try it again with the tailgate up and see if you detect any difference.
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I am going to buy a new 06 Dodge Diesel pickup. I am interested if anyone can tell me the difference (if any) in the fuel economy between the Automatic Transmission and the 6 speed manual. All of the other Dodge pickups I have owned have been 5 or 6 speed. Thanks for the Help.
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Replying to: farmerdoug (Oct 04, 2006 7:40 pm) kcram - Pickups Host |
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Replying to: farmerdoug (Oct 04, 2006 7:40 pm) |
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