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Old 02-21-2000, 05:33 PM
Al M.
Posts: n/a
I was wondering if it was safe to use 10w30 motor oil on my 87 420sel. I live in the dallas area and I had used 10w40 in the past.
I don't have an owner's manual so I don't know which is oil types are used during the year.

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Old 02-21-2000, 08:02 PM
Bill Wood's Avatar
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Join Date: Mar 1999
Location: Johns Creek, GA, USA
Posts: 5,013
Here's the recommended oil table from the MB maintenance manual for your 116.965 engine. My concern would be the ability for 10w 30 to handle those hot Texas summer days...

Bill Wood - Webmaster, LLC
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Old 02-21-2000, 09:26 PM
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Join Date: Feb 2000
Location: Santa Fe NM
Posts: 48
In Texas hot weather I would stick with higher weights. A 20-50 or 20-40. I personally would use a single viscosity oil like 30W. It has no added polymers to make it multi viscosity capable. It is only base oil. Polymers are more prone to burn and form carbon deposits.

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Old 02-22-2000, 07:44 AM
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I also live in the Dallas area and drive 60k to 70k miles per year. I use 15W40 in all my cars, and I have driven them to high mileage with minimal problems (after all no machine can last forever) My 240D went 516,000 miles on 15W40 before finally giving up. My 300E has had nothing but 15W40, but it's made it only 168,000 but still in great condition.

I read many years ago that 10W40 was the one to stay away from. It seems that there is an additive called VI. This is the additive the allows the viscosity index to stretch from the thinnest to the heaviest with change in temperature. 10W40 has an extraordinarily high amount of VI. The high amount of VI additive causes extreme carboning problems. I have never experienced this with 15W40. It appears that it takes a very much higher amount of VI to make the stretch down to 10, than it does to make it down to 15.

As for brand, I have my own that I believe in, but I won't name it hear. If I did you would have about fifty posts to your message in about thirty minutes. Oil for some reason gets everyone chiming in with their opinion.

My comments could be considered opinion, but I hope you see that they are backed up with the results of high miles in your area of the country. Boy, do you really think we're looking at another drought this year?

Good Luck,

Larry Bible
'84 Euro 240D, 516K miles
'88 300E 5 Speed
Over 800,000 miles in
Mercedes automobiles
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