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2016 E400 4Matic Sedan
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After 2000 miles of driving, I found the oil was at the lower end of the check stick. Added what I thought to be 15W-50 synthetic but it was actually 5W-30. Will this be any problem? I think 5W-30 is too thin for this big V8. Should I go ahead drain all the oil out and fill it up with 15W-50 or I could drive it for a month or two?
 

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1991 300 SE
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Did you add synthetic or dino? It won’t be a problem – 5w 30 is too light but you added only a quart.

On a personal note: I’d change it, it would bug me, but it would be a waste.
[:(]
 

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w126 420 sel
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hmmm...i'm running 5w-30 fully synthetic engine oil, lubro moly. should i be concerned about anything, i;m already on my third oil change with this type of oil. so if the weight is 5w compared to 10w, what does that mean in regards to the engine. is my engine working a bit on the easy side...?
 

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1991 300 SE
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blue420sel - 4/3/2005 4:46 AM

hmmm...i'm running 5w-30 fully synthetic engine oil, lubro moly.
Do you have to add oil between changes? Aren’t you using 5w 40 L/M? I suppose they may make another weight but all I see sold is 5w 40, which would be perfect. I’m planning on using it in my M103.

http://www.eurosportacc.com/lubromolyoil.htm
 

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quote>
5w 30 is too light but you added only a quart.
>unquote
Why is 5W30 too light? For decades Mercedes has published an oil viscosity vs temperature chart (which I guess nobody read) so you can pick an acceptable oil based on where you drive.
 

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5w 30 is too light because I and other V8 owners have experienced relatively high oil consumption using that weight. When we use a higher viscosity there is no need to add oil between changes. Yes, there could be a mechanic reason for the higher consumption rate but with the exhaust clear and no more adding oil, the higher viscosity oil does the trick. All of the mechanics I have dealt with also recommend 20w 50 for the V8s; this is particularly true in the South and Southwest where winters are mild and summer is brutally hot. 5w 30 is too light.
 

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450 SL 1976
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jdc1244a - 4/4/2005 4:01 AM

5w 30 is too light because I and other V8 owners have experienced relatively high oil consumption using that weight. When we use a higher viscosity there is no need to add oil between changes. Yes, there could be a mechanic reason for the higher consumption rate but with the exhaust clear and no more adding oil, the higher viscosity oil does the trick. All of the mechanics I have dealt with also recommend 20w 50 for the V8s; this is particularly true in the South and Southwest where winters are mild and summer is brutally hot. 5w 30 is too light.
I use 20/50 oil, but I still need to add oil between changes... approx. 1L pr. 1500-2000km (about 1/4 gallon pr. 900-1200 miles...

Hmmm, that sounds a little high.....? The oil consumption, I mean...
 

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Using this logic when your engine is totally shot and you wind up using 90w gear oil you'd recommend that to everyone. 5W30 is NOT to light for northern climates.
 

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SLK55 (2006) C36 (1995)
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hm....the secret to keeping an old diesel on the road?
 
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