Don't know about the temperature thing.
My MPGs are all over the place with city and highway. I am not a right lane driver, I like 8 to 10 miles per hour over the limit. I Have done some aero mods and others to come.

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1999 Mercedes E300TD daily driver sold at 238K miles 106K miles were mine, rust worm got it :-(
2006 Mercedes CDI new daily driver! 56,000 miles May 2016 now 85,625 Apr 2018 and Apr 2019 101,000 miles Apr 2020 109,875. March 2024 135,250, Dec 2024 145,000 miles

That's really cool! I will need to wait until I have the car to look further into aero mods. That will be fun to play with. If there are no technical issues to bumping up the operating temperature I would think I may see another couple MPG increase from just that change.


Some things that I will need to consider when changing operating temps:

-Transmission operates at the same temp(or really close) as the engine-
-the turbo OM606 may not have piston skirt oil nozzles/jets
-not sure how sensitive to oil viscosity these engines are
-not sure exactly how the piston rings will be affected(how much tighter they will get) by the slight temp increase
-cooling system components that are in marginal condition may leak or fail due to the higher pressures/temps. Will need to weed these out.
-clutch operated cooling fan would be engaged most of the time-may need a work around for this(electric fan?)




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__________________
Josh


2005 E320 CDI

2002 VW Jetta TDI

I am not at all certain but I believe that Euro E300 turbo diesels run a hotter stock thermostat. Perhaps 85C but am not at all certain.

Just found . . .
VALEO Part # 819970 Opening Temperature [°C]: 85 Found at ********.com


Stock 80C = 176F

Available 85C = 185F

Likely a slight positive effect with very little if any negative results.

__________________
1999 Mercedes E300TD daily driver sold at 238K miles 106K miles were mine, rust worm got it :-(
2006 Mercedes CDI new daily driver! 56,000 miles May 2016 now 85,625 Apr 2018 and Apr 2019 101,000 miles Apr 2020 109,875. March 2024 135,250, Dec 2024 145,000 miles

I saw those options too. I found an Omix-Ada unit part number: O321710652 that is 195 Deg F and can be purchased here:

http://www.overnightautoparts.com/storefront/?sid=132512FC88A9&rid=132512FC88A9&N=9253+4294965871&Vi=11206 4294961021 1668&mk=Mercedes Benz&md=E300&y=1999&Nr=OR(AND(make:Mercedes Benz,model:E300,year:1999),AND(universal:1))


Question I have about it is will it for sure fit the OM606, and does it have the rear bypass disc section like the original has? That picture just doesn't show if it does of not. If it will fit, and has all the proper components it may be ideal for a drop in replacement for added MPG's.







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__________________
Josh


2005 E320 CDI

2002 VW Jetta TDI