Sythetic Oil
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From: Dallas, Texas
W203 C55 and SAAB 9-3 2.0T
Sythetic Oil
So I was told today that I should NOT change my engine over to Synthetic oil? The car has 145k on it? Ive never had anyone tell me not to do this before. Are Mercedes just more picky or is it not true?
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From: North Carolina
98 Black C43 , 12’ ML 350 Blutec
I picked-up my 91' 420SEL with 175k 3 years ago and changed over to synthetic.I now have 214k on the clock,no problems.Synthetic will just clean the internals of all the sludge.Go for it! 
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MBWorld Fanatic!
Joined: Jul 2007
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From: Dallas, Texas
W203 C55 and SAAB 9-3 2.0T
Its was a tech at Eurosportauto in Dallas Texas. A very well known shop here in town. The guy was pretty rude. He also told me that he hadn't seen any 190e in years. Then he told me not to change the tranny fluid either. So I went to another shop and got a different answer.
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From: San Jose, CA
2007 E63 w/P30 and Eurotech CF Diffuser
Official FAQ from Mobil
Myth: Mobil 1 will leak out of the seals of older cars.
Reality:
Mobil 1 does not cause leaks. In fact, Mobil 1 was tested in dozens of industry-standard and OEM tests to prove its performance. It is fully compatible with the elastomeric seals and gaskets used in virtually all modern engines.
When the first Mobil 1 was introduced 30 years ago during the energy crisis, it was a very low viscosity grade (5W-20) that was optimized for fuel economy. At that time, engines were designed for much heavier grades of oil (e.g., 10W-40) and tolerances were much “looser” than in today’s engines. Sometimes, the original Mobil 1 formula used in an older engine would actually clean out the sludge build-up that was keeping the oil from leaking. Engine designs produced since the mid-1970s are made with tighter tolerances and better seals, and the phenomenon has disappeared.
Likewise, in an older engine in good condition – one that does not have oil leaks or one that has been rebuilt properly using new oil seals – Mobil 1 provides the same advantages as when used in a new engine. If an older engine has an oil leak, ExxonMobil recommends repairing the leak, then using Mobil 1.
Reality:
Mobil 1 does not cause leaks. In fact, Mobil 1 was tested in dozens of industry-standard and OEM tests to prove its performance. It is fully compatible with the elastomeric seals and gaskets used in virtually all modern engines.
When the first Mobil 1 was introduced 30 years ago during the energy crisis, it was a very low viscosity grade (5W-20) that was optimized for fuel economy. At that time, engines were designed for much heavier grades of oil (e.g., 10W-40) and tolerances were much “looser” than in today’s engines. Sometimes, the original Mobil 1 formula used in an older engine would actually clean out the sludge build-up that was keeping the oil from leaking. Engine designs produced since the mid-1970s are made with tighter tolerances and better seals, and the phenomenon has disappeared.
Likewise, in an older engine in good condition – one that does not have oil leaks or one that has been rebuilt properly using new oil seals – Mobil 1 provides the same advantages as when used in a new engine. If an older engine has an oil leak, ExxonMobil recommends repairing the leak, then using Mobil 1.
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Anectdote:
When I was waiting at a franchise oil changer, a customer ordered synthetic for his Focus. When the manager found out, he ordered it to be drained and filled with regular oil. He just said that it should not be done, as if it were a serious specification, but did not say why. It might have been an '08 Focus.
When I was waiting at a franchise oil changer, a customer ordered synthetic for his Focus. When the manager found out, he ordered it to be drained and filled with regular oil. He just said that it should not be done, as if it were a serious specification, but did not say why. It might have been an '08 Focus.
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MBWorld Fanatic!
Joined: Jul 2007
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From: Dallas, Texas
W203 C55 and SAAB 9-3 2.0T
I am going with what Louden tells me. They have been in Dallas doing Mercedes work for 30 years and have a huge following. I'll talk with one of the techs and see what he says.
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From: Las Vegas
1987 190E 2.3
I would have gone to a different shop too.
