Diesel engine oil for gas Mercedes engine?? why? - Mercedes-Benz Forum

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post #1 of 3 (permalink) Old 11-06-2006, 08:27 AM Thread Starter
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Diesel engine oil for gas Mercedes engine?? why?

I recently purchased a 1997 E420 with M119 engine & 105k miles. While reading up on engine oils, I noticed that a heavy-duty oil for trucks & diesels like Mobil Delvac or Shell Rotella T 15W-40 dino are recommended for my car??

What is the reason for my M119 engine needing this type of oil? Also, is it not recommended to use a regular SJ/SL rated 10W-40 dino, or even a Mobil1 full synthetic 0W-40?

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post #2 of 3 (permalink) Old 11-06-2006, 08:50 AM
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Lot of oils has dual-grade ratings.
Meaning they can be used in gas and diesel engines. That conflict with the principles of diesels and gassers having different chemistry, therefore oils suppose to have different chemical balances in them for different application.
Anyway, owners have no way to test the oils on their own and real life results might show up after driving 200,000 to 300,000 miles.
So practically we have to rely on what the manufacturers say.
Mercedes engines were build with dino oil in mind till about 2000, so your engine and flexible service system was design for that. Later on somebody "proved" dino oils making excessive sludge during 13k change intervals. Our 99 model had about 3 changes done with dino oil and I didn't notice any negative effects, but synthetics are so cheap now, that I see no reason not to give the car additional benefits.
2-cycle synthetics for my LE PersonalWaterCraft (jet ski) run for about $20 a quart and at full throttle they burn awfully fast.
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post #3 of 3 (permalink) Old 11-06-2006, 10:27 AM
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I wouldn't put 15-40 in your car during the winter for sure. Diesel engines have a diiferent oiling system. Where di dyou read that disel oil was reccomended?
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