Which is likely to get to normal operating tempurature first?

Coolant, Engine Oil, Transmission Fluid, Power steering Fluid?

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RIP: 80 300SD
RIP: 79 450SEL
2002 E430 4matic (212,000km)
2002 ML500 'sport'

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FACEBOOK: PANZER450

I'd think that it'd be

engine oil
transmission fluid
coolant
p/s fluid

but could be wrong.

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1983 Mercedes-Benz 240D
Automatic, A/C, Power Sunroof, Power Right Side Mirror
231K Miles FOR SALE MAKE OFFER

I think coolant would be first, engine oil last or second to last.

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1985 CA 300D Turbo , 213K mi

Well from watching the pressure drop on my handy dandy oil pressure guage for years I would say the coolant way before the oil does.


Although on really cold days in the winter it seems to be the oil, and during the summer the engine warms up so fast I don't pay attention.

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1999 SL500
1969 280SE
2023 Ram 1500
2007 Tiara 3200

Put an infrared thermometer on your PS reservoir. My bet goes to it. It has the smallest volume of fluid and starts working as soon as you turn the wheel. It also has no cooling system.
Learned some things when I had to work on the power steering of my Bluebird Wanderlodge. Made some modifications that dropped the fluid temperature 100 degrees.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

No idea about the PS fluid. My 190E 2.3-16 has an oil temperature gage so I can watch it warm up. It lags the engine coolant by 10 miles on the highway. Given the PS system has no cooler, I would think it makes relatively little heat being pumped around the circuit. But that is just a guess. I would think the manual transmission fluid, little more than a liter and half or so, warms up pretty quickly, but like the PS fluid, I am not sure that its normal operating temperature is not ambient temperature dependent (unlike the engine oil and coolant). Jim

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Own:
1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles

Owned:
1971 220D (250,000 miles plus, sold to father-in-law),
1975 240D (245,000 miles - died of body rot),
1991 350SD (176,560 miles, weakest Benz I have owned),
1999 C230 Sport (45,400 miles),
1982 240D (321,000 miles, put to sleep)

Does the P/S system on our cars actually get hot? I don't think it does....I've checked my fluid before after over an hour of driving, and it was barely warm....

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-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)

Should run at 150 degrees.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

what are some average driving conditions before you guys are see operating temp on your coolant?

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About 3-5 blocks depending on outside temperature.

During the summer about 100ft. Now it takes about 3/4 of a mile for the guage to move, and more importantly to get heat!

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1999 SL500
1969 280SE
2023 Ram 1500
2007 Tiara 3200

it can take 2-3 miles in winter for me, even if I was plugged in.

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1984 123.193 372,xxx miles, room for Seven.

1999 Dodge Durango Cummins 4BTAA 47RE 5k lb 4x4 getting 25+mpgs, room for Seven.