Last post on Nov 17, 2013 at 8:38 AM
You are in the Volkswagen Jetta
What is this discussion about?
Volkswagen Jetta, Biodiesel, Diesel, Sedan
#1206 of 4777 Re: Oil Changes for the 2004 Jetta TDI [alltorque]
Jan 10, 2007 (12:41 pm)
It is truly amazing how just a difference in perspective makes. On the synthetic oil thread, I am sure there are a number of folks who on the one hand think I am certifiably nuts: to a polite, lets wait to hear how his Honda Civic (gasser) BLOWS UP due to running 20,000 mile OCI's.
On your post at hand, I think you could possibly change your intervals after a careful reading of your VW specifications and seeing if the multiple specifications will web or cover your goal (higher than 10,000 mile OCI's).
So to me for all I have read, bets are off for the PD or pump duse motor. Howwever if your owners manual, technical shop manuals, Skoda web sites will let you shoe horn or fold your (engine's oil specs) way into the VW 507.00 specification, ELF shows as high as 30,000 miles per OCI.
So on the 2003 Jetta TDI motor the spec is VW 505.00, 10,000 mile OCI. Turns out Delvac One 5w40 aka Mobil One Truck and Suv DOES NOT meet VW 505.00 specifically. ROAD BLOCK. However it does meet CF-4 which is a much more stringent specification, which of course exceeds VW 505.00 specification. Next Delvac One also meets CI-4 specifications which is still FAR higher than the CF-4 specification. (this is also duplicated on the ACEA specification side). Now all this is with the up to 500 ppm LSD in mind. Even at that, most oil analysis test good to go to 15,000 to 25,000 miles. So with the advent of ULSD, or 15 ppm that is like > 90% LESS sulfur, which means it tends to generate even less by products ergo app 30,000 is now with in the useful life.
#1207 of 4777 MPG in cold weather
Jan 11, 2007 (5:25 am)
I've been getting +53 mpg on my '06 Jetta tdi. I've noticed that when the temperature drops (It's in the high 20's today.) my mpg goes down a coupla mpg's. Anyone else notice this phenomenon? What's the explanation?
#1208 of 4777 Re: Oil Changes for the 2004 Jetta TDI [ruking1]
Jan 11, 2007 (6:10 am)
ruking1, You know, and I know and hunfreds of thousands of Europeans know that 20,000 mile OCI's in modern gasoline engines is fine - the manufacturers simply wouldn't advocate it if it wasn't and there are many many 150k+ mile engines roaming around Europe not breaking down, not burning oil and just getting on with life regardless of the 20k OCI's. My last Peugeot gasoline engined car only required it's initial oil-change at 20k miles and ditto thereafter. Times have changed since the days of mineral 20w-50's, poor tolerances and old materials. Problem, in USA at least, is that the service industry has chosen not to move on and pass the benefits onto their customers; for reasons we can all understand.
As for my TDi's OCI, I'll stick with my 505.01 for now, (i have a couple of changes' worth left), but will be looking at a new Skoda with the 2.0 TDi PD later in '07 so will be interested to see what that calls for in the way of specs and OCI. May even go mad and get the 2.5 V6 TDi. My neighbour runs an Audi A6 Quattro with 3.0 TDi. Wonderful device but maybe a bit big for my needs. On the other hand...........you only come this way once, I think. One think is certain; it will be a cold day in Hades before I go back to gasoline.
Many thanks for your always-valuable input.
#1209 of 4777 Re: MPG in cold weather [music287]
Jan 11, 2007 (12:55 pm)
All automobiles lose a certian percent of MPG in colder weather. This is due to onboard computer injecting more fuel.
It injects more fuel for several reasons including;
*)Cold engine is harder to keep running due to thicker oil.
*)Cold fuel does not ignite and burn as efficently.
*)You are loading the engine more with additional electicial equipment.
*)Battery requires more charging.
*)Cold xmission is less efficent (thicker oil...etc)
*)Cold differential takes more power (thicker oil...etc)
*)Cold wheel bearings take more power to move.
*)Rubber in tires is stiffer.
The reason you may notice this phenomena on TDI engine is because it is more efficent to begin with. (5% of 50MPG is more than 5% of 20MPG)
I hope this answers your question.
#1210 of 4777 Re: Burrr Freaking Cold here!!! [bpeebles]
Jan 11, 2007 (1:46 pm)
This is Steve from Minnesota where it can get really cold too. I've had many discussions over the years about whether or not windchil effects cars. I think the answer is yes. Cars produce heat and cold wind will make the car cool faster. It's basic physics. So, I would disagree with you and say that windchill, although it was created to apply to humans, actually does effect cars.
Sometimes I'll run my 04 tdi in a lower gear to increase the rpm and heat up the engine faster. I also installed a TDI Heater that really helps on very cold days.
Just curious, do diesel engines run cooler because they run at lower rpms as compared to gas cars?
#1211 of 4777 Re: Burrr Freaking Cold here!!! [scalvit]
Jan 11, 2007 (2:35 pm)
hi Steve from Minnesota. any snow there yet? still none here in new england.
I agree with your points re wind chill.
Re your curiosity, I would say no that is not really the major reason although it might be a tiny factor. I think the reason is that diesels produce less waste heat per unit hp than does an equivalent gasser. or something like that.
#1212 of 4777 Why does diesel cost more than gas?
Jan 11, 2007 (2:44 pm)
Here in Minnesota, diesel fuel costs about 35 cents more than regular gas. I thought that diesel required less refinement than gas so it should cost less, right? Does anyone know the answer to this question?
#1213 of 4777 Leasing My TDI
Jan 11, 2007 (2:48 pm)
I have to return my leased TDI in June 08. If I decide to buy the car, VW will sell it to me for about $12K. I was surprised to learn that 04 TDI Jetta wagons sell for about 19k. They seem to keep their value longer than regular Jettas. I may find in 08 that my car has a market value much higher than what it will cost to buy it. Anyone have any thoughts about TDIs keeping their value higher and longer?
#1214 of 4777 Re: Leasing My TDI [scalvit]
Jan 11, 2007 (3:13 pm)
I think the 7k to the plus side says it all. You will probably have your choice of buyers and they will probably bid the price up from 19k.
#1215 of 4777 Re: Why does diesel cost more than gas? [scalvit]
Jan 11, 2007 (5:15 pm)
Diesel and home heating oil are the same product. You are competing for the same product with homeowners. Summer prices lower for same reason.