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  #1  
Old 08-29-2017, 09:55 PM
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Motor oil for 1986 560SEC

Hi Guys

Which motor oil should I use for southern California weather?

Thanks
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Old 08-29-2017, 10:20 PM
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Same as for Cape May
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Old 08-29-2017, 10:22 PM
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Hate to contribute to an oil thread but ....

My 560SL (same engine) was very happy with a synthetic 15w-40 diesel oil. The diesel oil has a high ZDDP (zinc) content which I think those engines crave. My choice is AMSOIL and my interval is 6000 miles.
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Old 08-30-2017, 12:42 PM
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8bender, I would use Mobil 1 15W50 in that vintage engine.
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  #5  
Old 08-30-2017, 07:31 PM
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what about 10W40 fully synthetic ?
Which brand would you go with ?


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Old 08-31-2017, 07:23 AM
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8bender, to the best of my knowledge "factory fill" for that vintage engine was 15W40 mineral oil. So IMO it's best to use Mobil 1 15W50 in that engine. That's the oil I have been running in our early-to-mid 1990's MB vehicles for the past 18 years. I change oil (and filter) every 7,500 miles.
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Old 08-31-2017, 09:31 AM
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Thanks

What about Rotella T6?
It has high Zinc in it , shouldn't it help?
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Old 08-31-2017, 10:26 AM
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Oil threads never go anywhere productive.

The net effect is something XX/40W or XX/50W, and a diesel rated oil can't hurt. 30W is too thin for your climate and not recommended in the factory books. I would do some research though before we blanket assume all diesel oils have tons of zinc in them

I live in Ohio not SoCal so 20/50 makes stuff hard to start. I generally put 5/40 synthetic diesel oil in stuff, or 0/40. Because its usually easy to find and cheap at Walmart, Mobil1 has become my norm, but not for any real reason other than price and accessibility.
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Old 08-31-2017, 05:00 PM
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8bender, I know nothing about Rotella T6. Perhaps you can do a "search" online and determine the benefits of using it. Unless the engine in your 1986 560SEC has recently been rebuilt, it probably doesn't make too much difference what oil you use, provided it is a high quality oil and is changed on a routine basis.
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Old 09-01-2017, 01:05 AM
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Quote:
Originally Posted by Ferdman View Post
8bender, I know nothing about Rotella T6. Perhaps you can do a "search" online and determine the benefits of using it. Unless the engine in your 1986 560SEC has recently been rebuilt, it probably doesn't make too much difference what oil you use, provided it is a high quality oil and is changed on a routine basis.
THIS! It's a fairly large displacement, low-revving, and understressed engine. Any decent quality oil in the right approximate viscosity (see owner's manual) should be fine.

That said, I like my T6. I change it about every 3,000 miles in the 300D, so it's probably expensive overkill. However, it also meets the specs for use in my Triumph, so I only have to buy one oil for both vehicles.
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Old 09-01-2017, 11:48 AM
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my mechanic friend had a very negative opinion about 10w40 oil.
he thought it was like a 'jack of all trades master of none' kind of thing and attributed many engine issues he saw (in volvo shop) to the use of it.
Quote:
Originally Posted by 8bender View Post
what about 10W40 fully synthetic ?
Which brand would you go with ?


Thanks
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Old 09-01-2017, 12:58 PM
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Quote:
Originally Posted by Hogweed View Post
my mechanic friend had a very negative opinion about 10w40 oil.
he thought it was like a 'jack of all trades master of none' kind of thing and attributed many engine issues he saw (in volvo shop) to the use of it.
In Volvo engines that don't call for it, I agree it would be a problem. In Benz engines that spec a 40W its just fine.
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