Well, there are about 1000 different preferences regarding oil on here. You can search to you are overwhelmed.

Chevron Delo 15W-40 is an excellent diesel rated dino oil.

I have used Rotella synthetic in both vehicles for the last couple of years. However, this was mainly due to price and not quality. The price gap between Mobil-1 and Rotella syn has narrowed dramatically and I've made the decision to switch to Mobil-1 on the 603 for the next change.

The benefits of synthetic are threefold for me:

1) Capability of changing the oil at 6K for the 603 and 5K for the 617.
2) Much easier cold starts
3) Better lubrication of engine components when the engine is very cold.

5w30/10w30 really have no place in any MB. Xw40 or Xw50 is really what belongs in the crankcase of a MB regardless of model, year, or oil. Maybe this isn't true on some of the very late model MB's but afaik they all use 0w-40.

Anyway "good oil" means a CH rated oil, as far as brands pick and chose. Walmart has their 15w-40 diesel oil that is $5 a gallon and comes in a blue jug. Most Autozones I have been to seem to carry Delo 400, Delvac 1300, and Rotella. Take your pick oil is oil.

I use Delvac 1 5w-40 in all my MB's year round.

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1999 SL500
1969 280SE
2023 Ram 1500
2007 Tiara 3200

I agree with this and I will continue using Mobil1 15w-50 and stop using the Lucas. I will never use oil 5W-X unless I own a Honda civic,( and that will never happen) BTW I found out about Lucas from 2 people.
1. A diesel mechaninc working on MB
2. A friend of mine truck driver. He does about 3K miles a week with his Kenworth truck and told me that since he used Lucas on his (BIG MAMA Diesel 2 years ago I think) his truck works at his best. He came down one day a year ago and saw my 78 300D and got one the following week, a beautiful 1980 300CD , he uses Lucas in all his cars everytime he changes the oil. My experince with Lucas was positive on my 123. I used a quart of oil every 1000 miles, but since my car had almost 400K I decided to add Lucas. I never burned oil since then. The car seemed quieter and not much smoke but indeed maybe compression wasn't that great either

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1987 300SDL
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Pic of this car:
http://www.gigapipe.net/300SDL/index.htm

As far as the fuel treatment, the general consensus is that RedLine diesel fuel conditioner or Power Service diesel fuel conditioner will provide some benefits. I don't have any knowledge of Lucas.[/QUOTE]

Brian,

I use amsoil products...and I seem to get good results...have you tried them? If so, what is your opinion?

Thanks

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1993 300D 2.5L 240,000+ miles

Ooops. i meant 10w-30.

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-Justin

91 560 SEC AMG - other dogs dd
01 Honda S2000 - dogs dd
07 MB ML320 CDI - dd
16 Lexus IS250 - wifes dd

it's automatic.

Amsoil has a very good reputation. Some folks swear by Amsoil. I have no personal experience with their products.

Some people love Amsoil, I'd use it if I could go down to the local store and buy it. I refuse to order oil, it costs a freaken fortune.

Delvac 1 costs me $4 a quart thanks to Walmart, their is no way I could get Amsoil 15w-40 to my door for that price.

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1999 SL500
1969 280SE
2023 Ram 1500
2007 Tiara 3200

I went to see my father about 160 miles round trip. I stop by Wal-Mart before and got the oil(needs an oil change soon) I also decided to use Brian's advice and got 2 bottles of Power Service the dark grey one from Wal-Mart. Accidentaly I pour half of the bottle I went very smooth all the way to the Bay Area and back, driving about 95 -110 MPH at times but mostly in the 75-85 range. I got a passport RD the red one, which I believe is the same thing as the blue one, and believe it or not it helps a lot
What I realized is that my RPM is not constant anymore. It stops most of the times when driving on city streets about 750-800. When I start it in the morning during warm up, it is about 650, if accelerate gently close to 1000 and keep it there for about 5 secs then release the pedal drops and stays at 500 as it used to before, what would be the problem?
Also Injector number 4 has a noise, as soon as I touch the metal line from the pump the noise is gone, the noise is not loud like a nock but much rather like a grind of some sort. Could be that I am missing the line brackets?
Thanks a lot and cheers

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1987 300SDL
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Pic of this car:
http://www.gigapipe.net/300SDL/index.htm

Replace the missing or broken injector line brackets ASAP. It doesn't take long to wear through the thin metal used in the those lines.

Varying idle could indicate a bad overvoltage protection relay or a failing engine rpm sensor. Could also be a loose electrical connection into the idle stabilization device on the back of the IP.

Sixto
87 300SDL

Hi, Thanks for your reply
I was wondering if you could be a bit more specific about this. How could I check the sensor to see it is failing? I will check the connection to the Idle Stabilization device, if it is good I could check the engine rpm sensor and if this is also good(if there will be a way to check it) I will replace the OP Relay,
or ?

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1987 300SDL
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Pic of this car:
http://www.gigapipe.net/300SDL/index.htm

I cheked the electrical connection at the back of teh IP and it is very strong, i can't even move it, nor the wires

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1987 300SDL
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Pic of this car:
http://www.gigapipe.net/300SDL/index.htm