W108 M130 - which oil do you prefer? - Mercedes-Benz Forum

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post #1 of 11 (permalink) Old 04-02-2014, 11:53 AM Thread Starter
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W108 M130 - which oil do you prefer?

Hello.

As I was studying at this time last year, I had Mercedes do the oil change of my W108. I told them to use 'the most correct oil for the car'. It started leaking a bit afterwards, nothing much but enough to notice. I had my suspicion that they put synthetic in it, but it wasn't possible to check.
Now it's about time to start it up and drive it back home from winter storage and since it's been leaking a bit, I need to top the oil off. Went to Mercedes to see that they put in oil from what they call 'main tank', meaning the oil they use in most ordinary cars. That oil, from my understanding, is 5W40 synthetic (but may even be 10W40 or 5W30, it will first be certain tomorrow when I get the receipt).
My Haynes manual says 10W40 with a zink additive. It's been running on either 5W40, 10W40 or 5w30 oil for half a year (around 2000 km). What should I put in it when this time comes around? I have pefect time this year, so I'll do the oil change myself (don't think I'm going to trust anyone with that now).

Just to make sure, the car has been perfectly fine with the oil it has in it right now. Oil pressure is perfect and pegged at 3 bar even at higher speeds until you lift off, then it drops for a moment. Also has pegged pressure at idle. The only way you would notice something off is the fact it never used to leak oil and it does after the change they did. If they used a wrong oil viscosity (such as 5W30), wouldn't I instantly notice by low oil pressure?

Thanks!
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post #2 of 11 (permalink) Old 04-02-2014, 12:38 PM
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I have been using 20w-50 conventional oil since I got my car over two years ago on the advice of my expert mechanic (a specialist in the Oldtimer engines). I have the M127 engine in my '62 W111 and it has helped control leaks. It is quite thick so may not be ideal if you are in a region that gets near freezing, but for us here in Oregin with Spring, Summer and Fall with no real winter (temps above 30-40 degrees F) it is good year round.

I add a ZDDP zinc additive at every other oil change but I do mine every 1,000-1,500 miles just because it helps clear out the fuel dilution common on early MFI cars like mine. These cars get a little oversupply of fuel at shutdown that can wash down into the oil. Well known issue on the 300sl too, tho that's clearly a different beast.
The ZDDP really quiets tappet noise after you have run it in for about 100-miles or so, or a solid hour of driving. Your oil will look much darker due to the additive so don't think there is something wrong, it should still smell like oil and not burnt, etc.

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post #3 of 11 (permalink) Old 04-02-2014, 01:28 PM Thread Starter
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Woah, 20w50. Sadly wouldn't work here, as we get down to about the freezing point every now and then in the spring nights.
There is quite some tappet noise in my W108, so I'll try adding some of that zink additive (told the mechanic to use a classic oil with zink but who knows), so yeah.
Since it's been on synthetic oil now, would changing back to classic mineral cause any damage? It's been run on either 10W40, 5W40 or 5W30 synthetic in the last season, which resulted in leaks around the engine compartment (but nothing more than that, oil pressure is perfect and it makes all the right clicky clacky noises!).
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post #4 of 11 (permalink) Old 04-02-2014, 02:29 PM
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It gets cold in Denmark? I'm running 20W-50 also, and the coldest it got this winter was a little below 0 F. I didn't have issues, but I know your part of the world can get considerably colder.

I've stayed away from synthetic after the one time I tried it - my car leaked like a sieve. Research showed me that the synthetic oil molecule is literally smaller than "normal" oil, and is better ableto get past seals and such.
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post #5 of 11 (permalink) Old 04-02-2014, 02:49 PM Thread Starter
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Yeah, it can get pretty damn cold here. It's been a somewhat mild winter, but it's still freezing outside in the nights.
I'll put some normal mineral oil in it instead of synthetic this year becuase of the leaks it has with synthetic, I just want to make sure the stories I've heard about the change from synthetic to conventional mineral oil aren't true (that changing from synthetic to mineral causes a lot of damage on the main engine seals). I don't want to go around changing all the seals in it.
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post #6 of 11 (permalink) Old 04-02-2014, 07:38 PM
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According to metric motors, rebuilders of Mercedes engines this is what they recommend

W108 M130 - which oil do you prefer?-imageuploadedbyag-free1396489110.250195.jpg


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post #7 of 11 (permalink) Old 04-03-2014, 02:39 AM
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I´ve always used Valvoline VR1 Racing 20W50 on my classics (Porsche 914, Jaguar E type S1.5, Mercedes Pagode and the W111 3.5 will be no exception) and Im happy with it. As its breed for racing porpouses, handles perfectly with a street usage, you´ll be always a light-year far from its service limits and the engine will be as protected as I cant be. Or at least thats the idea of using this oil.

Changed every two years or 3000mls, whatever happens before. with its filter always.
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post #8 of 11 (permalink) Old 04-03-2014, 06:12 AM
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Every two years?
There is no oil on this planet, organic or man made that I will keep in my engine for two years but that if just me.


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post #9 of 11 (permalink) Old 04-03-2014, 10:15 AM
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use shell rotella T 15/ 40 .[ wall mart ]
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post #10 of 11 (permalink) Old 04-05-2014, 08:46 AM
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Quote:
Originally Posted by kavadarci View Post
According to metric motors, rebuilders of Mercedes engines this is what they recommend
+ 1

On the recommendation by Metric Motors, I have been using Castrol 10-40, and I change it about once a year, no more than 1200 miles are put on the car every year. On a side note, I have been using Castrol conventional on my 1995 Toyota pickup up truck since I bought it new in 1994 and the engine still fires up in the first crank and runs strong and smooth with 136,000 miles on it. I change that oil every 3-4k miles

Last edited by Luna Gaudi's 72 250; 04-05-2014 at 08:50 AM.
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