I know in old cars synthetic can clean out gunk that holds things together, but I have a low mileage Jeep with the Hemi motor. Just changed oil and put in synthetic, now a hose connection to the oil cooler is leaking like crazy. Could the oil cause this or is it just a coincidence? Only have 24k miles.

thanks

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MB-less

I've heard of it happening, but it hasn't been my experience personally. I suppose it's possible, but could just be a coincidence.

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Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar.

83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 400,xxx miles
08 Suzuki GSX-R600 M4 Slip-on 22,xxx miles
88 Jaguar XJS V12 94,xxx miles. Work in progress.

Nah, that's just a Chrysler doing what it does best.

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CENSORED due to not family friendly words

Synthetic oil does not cause leaks, but it might expose them....

X2.

JEEP = Just Empty Every Pocket.

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Just say "NO" to Ethanol - Drive Diesel

Mitchell Oates
Mooresville, NC
'87 300D 212K miles
'87 300D 151K miles - R.I.P. 12/08
'05 Jeep Liberty CRD 67K miles
Grumpy Old Diesel Owners Club

Any good oil with good detergent will clean things out. I have personally put synthetic oil in many cars without any issue.

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01 Ford Excursion Powerstroke
99 E300 Turbodiesel
91 Vette with 383 motor
05 Polaris Sportsman 800 EFI
06 Polaris Sportsman 500 EFI
03 SeaDoo GTX SC Red
03 SeaDoo GTX SC Yellow
04 Tailgator 21 ft Toy Hauler
11 Harley Davidson 883 SuperLow

This.

Had the same thing happen on my olds van and when I went back to Dino oil it stopped leaking.


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Dino is better. (INCOMING!!!)

Or as a dear departed member once said, 'I never change the oil. My cars run fine and after a while I just trade them in."

Oh yeah I remember that guy. Joe something I think.


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I have had 5 Jeeps, all solid and dependable. 2 covered 5 years and had no maintenance beyond oil changes.

Turns out my filter (invisible from the top) was leaking directly on the hose connection. Guess I should crawl under there in daytime.

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MB-less

I put Mobil-1 synthetic transmission fluid in my '96 E300D (722.4) when I bought it at 249,000 miles and made a small existing front pump seal leak worse. Changing back to dino fluid did not help; I ended up having to get the transmission rebuilt.

OTOH, I put Mobil-1 TDT 5W-40 in the engine of the same car and had no problems at all. Now at 277,000 miles it neither leaks nor burns any oil between changes.

Jeremy

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970

I remember that character, classic.

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1979 Black on Black, 300CD (sold), 1990 Black 300SE, Silver 1989 Volvo 780, 1988 300CE (vanished by the hands of a girlfriend), 1992 300CE (Rescue).

He didn't by any chance ride a Ninja 250, did he?

__________________
Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar.

83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 400,xxx miles
08 Suzuki GSX-R600 M4 Slip-on 22,xxx miles
88 Jaguar XJS V12 94,xxx miles. Work in progress.

Does it fit a Gucci handbag?

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1979 Black on Black, 300CD (sold), 1990 Black 300SE, Silver 1989 Volvo 780, 1988 300CE (vanished by the hands of a girlfriend), 1992 300CE (Rescue).

My 1981 300D has cracked/worn valve seals. It only seems to consume oil at cold engine temperatures because if I drive her on long trips there is no noticeable oil consumption. I have been using synthetic in this engine as well and the consumption is actually a little less. I say ++ to synthetic for any engine.