Robert in CT.

Hello

I am looking for advice if I am using the best engine oil for my 1999e300dt. I currently use Delvac Synthetic, but have heard a few things about Amsoil and Mobil one. Also would moving to a 5w-30 give me more mpg? Any damage potential here? The car is amazing and has 145k miles and I plan to get it to at least 300k if not more. Thanks!

Rob

Ausmbtech

I would stick with the delvac synthetic, both mobil 1 and amsoil are very good but the delvac is very well suited to european turbo diesel applications.

If you aren't having any problems (excessive oil consumption or sludging) then stick with it.

Changing to 5w-30 won't help your mpg by much, but may be a good idea if you live in a colder area, otherwise stick with what works for you.

240D 3.0T

Amsoil and Mobil 1 are Mobil Delvac. Amsoil uses Mobil's oil.

There is no 5-W30 oil that is C rated for Diesel engines, using it will damage the engine because it can't handle the soot.

Messerchmidt

mobil 1 truck and suv 5w40 for turbo diesels...only way 2 go

Untertürkheim

I would have to say the best oil for diesel MB cars without DPF (those that require the 229.31/51) is the Liqui Moly 5w-40 Diesel Synthoil:

http://www.liqui-moly.com/liquimoly/...id/d_1340.html

The reason is that it is the only FSS approved diesel-specific motor oil that has the full SAPS content, unlike the 229.31/51 oils that have low SAPS for DPF compatability.

Goatman

Amsoil does NOT use Mobil One's oil.


They have four or five different diesel oils. All of which are better than Mobil's.


Amsoil is the only oil I use. I graduated from Mobil One years ago...

uberwgn

Rob, if you're talking about the M1 5W30 found at Walmart, etc., the answer is no, it doesn't meet any spec required by the car.

There is a business in OH that is importing a Mobil product from Europe, it's 5W30, and does meet MBz specs. It's aimed at the cars equipped with DPF. It should prove to be a superior lubricant. However, switching from a xW40 to and xW30 would provide a fuel economy bump in the 2 -4% range, no more.

FYI: AMSOIL purchases its basestocks from Mobil.

240D 3.0T

That is incorrect.

Goatman

No, you are incorrect.


Amsoil buys OIL STOCK from major manufacturer's like Mobil, Sunoco, etc and uses that as a BASE for their oils. As does Royal Purple, Red Line, etc. They are not an oil company, they have to start with the same stock as everyone else.


Their final product has NOTHING in common with anyone else's products other than the initial base.

You're typing to an Amsoil dealer who has done all the leg work.

240D 3.0T

In other words....AMSOIL purchases its basestocks from Mobil!

Besides being basically the same oil, the only different being the choice of additives. Might as well stick with the real deal (Mobil) and cut out the middleman (Amsoil).

As if that makes a difference? Go to any auto show, they are always there peddling for more dealers. I buy my bypass oil filter from a single mother selling out of her livingroom.

lkchris

The REAL answer is ... use an oil that meets the relevant Mercedes specification.

Your engine requires oil meeting MB229.5

It might make one feel "manly" to use something called "truck and SUV" or "turbodiesel truck," but the fact is the only oil from Mobil that meets Mercedes specification is 0W-40 European Formula.

Goatman

I guess if you're dumb enough to think base stocks are what you get in the Amsoil diesel bottle, you should hook up with Ohlord.

You two have alot in common...

240D 3.0T

uberwgn and lkchris, lets leave this devolving monkey to sling crap with himself. Its obvious he has no idea what quality oil is. He still thinks OM6xx engines work like g@ssers.

Goatman

LOL. Its the king... Without his crown....

lkchris

This is unintelligible.

But, you don't know of a higher quality oil than Mobil 1 0W-40.

Maybe something from Fuchs or Total ... maybe a little, only.

All are installed at factory--which certainly knows its oil.

The world's come a long way since the 1970s, i.e. the 240D era. So has engine design and so has motor oil research and development. Yes, you may use MB 229.3 oil in '97 and earlier engines ... which is of course not relevant to this thread.

It's only an ego trip to think diesels different. Or what some marketing hype has attempted to convince. Everyone wants to be different, and guess what--marketers know this.

If Mercedes says the OM648 can go 13K miles change interval on Mobil 1 European Formula 0W-40, I suspect they're correct. Especially since the interval is longer in Europe.

If Mercedes says the OM642 can go 10K miles change interval on Mobil 1 Formula M ESP 5W-40, I suspect they're correct.

I rather imagine they've tested it.

You can too.

There is NOT a different MB motor oil spec for diesel engines vs gasoline Mercedes engines. You can take to the bank this is not Mercedes making an error. They are, of course, the first manufacturer to install diesels in cars, the inventor of the internal combustion gasoline engine (and, in fact, the automobile) and were closely associated with Dr. Diesel.

PS: Yes I know Mercedes' approval of an oil depends on the oil manufacturer arranging and paying for an independent test and submitting it to Mercedes. This obviously means there are oils out there not on the list and not able to state they meet the spec that indeed would if tested. Very little reliable information available to substantiate which those are, however. Pretty easy and no compromise whatsoever to stay with officially approved and listed products.

240D 3.0T

Incorrect. Only oils with a Cx rating should be used in diesels. There IS a difference.

Incorrect on all 3, sorry.

1: William Barnett 1838
2: Nicolas Joseph Cugnot 1769
3: They never worked together and Diesel died 20 years before Mercedes ever developed their first automotive Diesel.

uberwgn

WOW! What did I miss

OK, Rob, are you still out there? here's a link to the '07 product guide direct from MBz:

http://mbca.cartama.net/showthread.php?t=28048

I think you need to see pg3.

Take care.

uberwgn

Why are you saying that? It's incorrect.

Refer directly to the latest product guide. Kent is 100% correct with his statement about the gasoline and diesels using the same quality standard apart from the newest diesel autos, which mandate 229.51. The API reference is bordering on meaningless.

240D 3.0T

If you like oils that don't handle Diesel soot.

Goatman

ROTFLMAO!!!!!!!



And you won't find a bigger Richard Cranium ego than The king.........



Those of us that know the truth know you can use diesel oil in gas, and vise versa. The king "knows" differently, but then again, what would a guy who drives a replica Volvo know?

240D 3.0T

A LOT more than an uneducated wannabe engineer like you.

So sad, you somehow think Volvo is related to Mercedes...they aren't even on the same landmass.

Untertürkheim

Please see post #5.

Crazy MB Rob

Amsoil is crap, previously working at an MB dealer for years, I've seen engines ran on quaker state synthetic, mobil 1 synthetic, and amsoil. All the correct weight oils. Quaker state (obviously) is not that good, oil would foam up and get more condensation in it and sludge up and cause the rings to carbon up in the pistons really bad. Mobil 1 the engines would run cleaner and mainly have no problems. The 5 vehicles I worked on where the customer had been using amsoil needed major engine repairs. That stuff is junk!! It also is NOT one of the oils that MB approves.

Crazy MB Rob

On the other hand, I know people that drive other cars that swear by amsoil. I haven't used it, but I know none of my customers will pay the price to buy Amsoil... soooo?

Untertürkheim

A lot of the motor oil confusion in the US comes from the fact that companies are allowed to sell hydrocracked/group III oils as synthetic here.

In Europe, they are not allowed to be called synthetic. That is reserved for true Group IV/V oils.

Pentosin, Liquimoly, and other European firms differentiate between synthetic,HC, semi-syn, and conventional oils, and their (real) synthetics are excellent.