I've used Rotella synthetic 1996 in my Passat TDI then my 99.5 jetta and to answere your question YES
Even though the TDI's had a 10K change interval I started changing at 6K.
Joe
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| Oil age vs. MPG http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=5&t=29676 |
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| Author: | glaspak845 [ Tue Feb 19, 2008 10:15 pm ] |
| Post subject: | Oil age vs. MPG |
Maybe its just me, but has anyone noticed a drop in mileage around 6000 miles on your oil? I use Shell Rotella-T and change it at the 6,275 interval or whichever the lower one is in the EVIC and lately I've noticed a drop in mileage below my "normal" winter average. I was getting around 19 with winter fuel and 4oz of Howes in the tank, now I'm getting around 16-17 with the oil being older than the service interval. Also, I have noticed the engine idling and running a bit louder with the old oil but that I consider normal due to oil age and me noticing that previously. Just wanted to see if anybody had any ideas. |
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| Author: | Uffe [ Wed Feb 20, 2008 3:56 am ] |
| Post subject: | |
I'd first check up on the MAP sensor. Those are notorious for becoming dirty and it will improve MPG if you clean it. If your oil makes your MPG drop, I suggest you change it ASAP! There has to be a big difference in the lubricating properties of the oil for it to affect MPGs. As an example I changed from a mineral 15w-40 oil to a full synthetic 5w-40 oil in my Patrol and got 2-3 MPG more. That's from a terribly cheap neas-as-makes-no-difference no-name 15w-40 to a Mobil 1 Synt-S 5w-40 oil! |
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| Author: | Joe Romas [ Wed Feb 20, 2008 12:57 pm ] |
| Post subject: | |
I've used Rotella synthetic 1996 in my Passat TDI then my 99.5 jetta and to answere your question YES Even though the TDI's had a 10K change interval I started changing at 6K.
Joe |
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| Author: | glaspak845 [ Wed Feb 20, 2008 1:21 pm ] |
| Post subject: | |
I have cleaned the MAP sensor the last two oil changes and plan to do it with each oil change. Although it is gunked up I do not notice any change in mileage after cleaning which is the exact opposite as everyone says so I do not think the MAP sensor has anything to do with it. I will be changing it this weekend but just was seeing what everyone else thought of my experience. Thanks, |
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| Author: | biggiefl [ Wed Feb 20, 2008 3:32 pm ] |
| Post subject: | |
When I got my CRD I ran 5w-40 Amsoil full syn. I was losing a quart about every 2-3k. The dealer told me to change it to 0w-40 Mobil 1 and it would correct itself. I did and have to add maybe a 1/2 quart during the 10-12k intervals. I have never cleaned my MAP and I get great mpg...should I clean it? Is it just that thing on the other side of the air filter intake? I change my airfilter every 15k and it is pretty nasty but not horrible. I have also had 2 EGRs replaced under warranty, not sure if they clean the system out when they do that or not. jUst changed the fuel filter at 35k as well....now I need 4 new sneakers and I will be all set for a while(I hope). |
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