Date registered: Oct 2012
Vehicle: Mercedes Benz W108 - 280 SE (1970) / Mercedes-Benz W123 200T (1983)
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Quoted: 20 Post(s)
W108 M130 - which oil do you prefer?
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?