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Registered
300 SEL
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6 Posts
Discussion Starter #1
I have a 300sel and am going to change the oil filters and plugs this weekend. what kind of oil should I use
 

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Premium Member
1990 SEC
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4,110 Posts
Where are you located?

How many miles on the engine?

Any other issues with the car (timing chain, compression, etc.)?
 

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Registered
1985 500 SEC, 2005 E320
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1,294 Posts
summer time is good for 20-50, winter 15-40. 10-40 is too light. but depends on where you live. if you live in north canada, 15-40 in summer. I cant really say for sure since your profile isn't updated and doesn't list where you live.
 

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1990 420sel
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324 Posts
I use 10W-40 as well based on the owner's manual recommendations. I have a leaky rear main seal, so it's dino oil for me.
 

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1991 300 SE
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18,534 Posts
Batou said:
i use 10w40, it works both in summer & winter... but i do get a bit of valve tap.
How cold does it get in ‘SoCal’? Below 32 for long periods of time? If not you can use 20w 50.
 

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Premium Member
1987 560SEC, 1987 UNIMOG U1700L
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326 Posts
I use 10w40 like the owners manual says. Haven't had any valve noise problems.
 

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E320
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2,798 Posts
hmmm.. does it ever run hot? i'd like to run full synthetic 10-40 just to free up some power, but i do consider 20-50 to be a damn good insurance policy. just a thought, but i'm sure the manual calls for it for use in germany, not the senoran desert. mine sits at 3 bar or maybe a tad below at idle when warm, so maybe i could pull off 10-40.
 

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Premium Member
1987 560SEC, 1987 UNIMOG U1700L
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326 Posts
yeah it gets up to temp sits around the 100 deg c mark, on some of the real hot days has gotten up to 110
 

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E320
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2,798 Posts
ooooh.. i'm a bit too obsessive compulsive about keeping my temp at 80degrees C. 100degrees C and i'd flip out and shut the car off! hahaha.. i'll stick with 20-50.
 

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Premium Member
1987 560SEC, 1987 UNIMOG U1700L
Joined
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326 Posts
100c is ok the mark is 1/2 way up the guage which is in the optimal range, if it goes into that red range or too quickly towards 120 then that is cause for concern.
 

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Registered
1985 500 SEC, 2005 E320
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1,294 Posts
even 110 is acceptable depending on what degree your thermostat is. Mine runs right around 80. On hot days, maybe 90 owners manual duggests lower weight for engines when new. over 100k, I stongly suggest 20-50 in the summer.
 
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