Finally got around to change the oil in my cars this weekend. Drained the old oil, changed the filter, then to my horror discovered that the Mobil 1 synthetic Truck and SUV oil was 5W-30 for gasoline engines and not the heavier ones for diesel. Since old oil drained, I had no choice but to put the wrong oil in.

So the question is how soon should I replace this with the correct oil. I am in Houston (hot climate) and I drive 400 miles per week at highway speed (or faster).

__________________
RH

16 GLC300
12 C250
98 E300D
89 300SE
84 300SD sold

if it was me i would change it asap.. id get some mobile delvac 15w40.. its what i have and its doing good

5w30 is to light, drive it for a week and change to the proper weight.

__________________
1999 SL500
1969 280SE
2023 Ram 1500
2007 Tiara 3200

I have noticed that they changed the T&SUV oil to 5W30 as well. I thought it still listed diesel engines on the label last time I looked, but no way I'm putting it in my MB.
Planning on 5W40 Rotella next change.

__________________
1971 220D/4-speed ~250K mi. Family owned (dads side) through three generations since <5K miles.
1992 Chrysler LeBaron, 3.0V6 125K. Family owned (moms side) through three generations since new.
1977 Chevy Camaro Continual hotrod project
1970 Cadillac Sedan DeVille 472ci and nearly 19' long
1974 Fiat Spider Still needs work

Rich,

What viscosity engine oil does your owners manual say to use?

P E H

Below is a quote from a Mercedes related oil Web site. The oil you have is specifically NOT recomended by Mercedes. I know what I would do. I would change it.

The best oil, the one highly recomended by Mercedes for Diesel cars, and teh one that neets the highest standars for your car, is Mobil 1 0W-40. Its a year-round oil

===============
some oils which are not recommended:
Mobil 1 SuperSyn 0W-30 SL/SJ/CF A1/B1/A5 9.7 doesn't meet 229.1 nor ACEA A2 or A3
Mobil 1 SuperSyn 5W-30 SL/SJ/CF A1/B1/A5 9.8 doesn't meet 229.1 nor ACEA A2 or A3
Mobil 1 SuperSyn 10W-30 SL/SJ/CF A1/B1/A5 10.1 doesn't meet 229.1 nor ACEA A2 or A3
These 3 oils do not meet MB spec of > 3.5 cP for high temperature high shear strength.
================

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'95 E300 Diesel, 264,000 Miles. [Sold it]

Drain it now and save it to use in your gasser - it's not "contaminated" or anything.

John

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John Hughes, was in Landstuhl, Germany but currently in San Antonio, TX


1978 280CE Astral Silver now 59,xxx miles and counting "Silber-Kugel"
1986 300E Black Pearl Metallic 143,xxx miles 5-spd daily driver w/ blk leather "Schwarz-Schönheit"
1989 190E 2.6 (euro) 5-spd Desert Taupe 112,xxx kms Had to leave behind in Germany!!! "Helga"
1983 300D Pastel Beige now 312,xxx + miles SOLD

OBK#24

Same thing happened to me, I didn't put it into my car yet . Got two gallons that I will give to my old man for his car. Didn't even look at the weight on the jug, just said 'Hey they got T&SUV!!!' and grabbed two gals.
Next time I'll read the label.

__________________
'02 BMW 325i
'85 300D 450k
'93 190E 2.6 170k(killed by tree)
'08 Ducati Hypermotard 1100S 6k
'06 Ducati S2R800 14k(sold)

Looks like the GMC and Ferightliner dealerships are still the best source for Delvac 1.

I don't know what the normal oil change interval is for the E300 diesel, but I would go half that distance, and then change the oil to a proper viscosity. If you think about, there are MANY MB diesels out there that go to the dealer for oil changes and don't get the proper oil time and time again for years and they run fine. A couple of thousand miles shouldn't hurt your car.

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'81 MB 300SD, '82 MB 300D Turbo (sold/RIP), '04 Lincoln Town Car Ultimate

Sooner or later every car falls apart, ours does it later!
-German Narrator in a MB Promotion Film about the then brand new W123.

Thanks for the feedback everyone. I will change oil when I get a chance. I really don't know what the Mercedes specs, the owners manual is the same one for gasoline engine also, so the manual say to use Mercedes approved oils. They must list the approved oil some where.

I have been using, based on recommendations in this forum, Delvac 1 then Mobile 1 synthetic 20W50, then Mobile 1 Truck SUV 5W40 (I think) before the latest mistake. I would like to stick with the synthetic oils and will see what I can find around Houston

__________________
RH

16 GLC300
12 C250
98 E300D
89 300SE
84 300SD sold

If you still can't find the M1 5W-40, you can use the M1 15W-50 instead, if it's in stock.

__________________
'81 MB 300SD, '82 MB 300D Turbo (sold/RIP), '04 Lincoln Town Car Ultimate

Sooner or later every car falls apart, ours does it later!
-German Narrator in a MB Promotion Film about the then brand new W123.

Mobil 1 0w40, 5w40, and 15w50 will all work just fine in a 606.

BTW any Mercedes dealer is also a Mobil dealer. They can get you Delvac 1 and usualy the price is about what you would pay online or from anyone else.

__________________
1999 SL500
1969 280SE
2023 Ram 1500
2007 Tiara 3200