Vivo

What,if anything, could go wrong if used in a 63?

Vivo

Anybody?

MB_Forever

I would stay within the recommended: 5W-40 for all 63s.

t83

all w211s run hot the amgs especially, the thicker the oil the better cooling at high temps. i would never EVER put 10w40 in my e55 and the 63 i would assume the same as well. if you drive your beast tamely the thinner oil will still reduce the life span of your engine.

Vivo

That's what I thought. What bothers me is that the dealer used it in my car. What could the symptoms be?

E55Pilot

the thinner oil is the 5W40, the 10W40 is thicker.

The AMG's do not run hot they run right at 200-210F and that's fine.

E55Pilot

Nothing, you are absolutely fine They put in 10W40 because you don't need the extreme cold protection on a 5W40.

The smaller the number the thinner the oil.
The larger the number the thicker the oil.

The small number in front of the w is the oils COLD viscosity. The number after the w is the hot viscosity.

emoving

Oh Crap! Is 10W30 Mobil bad! I do not drive in the cold too much. I just changed it and this is all the had.

bfnnrgn

The 65s use 0W40

liquiddi

Oil is oil. You guys are way too paranoid. Any Mobil 1 synthetic oil will be fine in your Mercs

RHBENZ

Not quite, thinner oil warms and cools quicker than ticker oil. 10w40 is good for most cars in US/EU, 5w40 is better for cars in colder climate. My guess on the 65's 0w40 is that their engines run much hotter than ours.

E55Pilot

Remember that the 0 in 0w40 is the COLD viscosity, not the hot viscosity.

0,5, or 10 will not change the hot characteristic of the oil, just the cold flow ability of the oil.

E55Pilot

Ding Ding Ding.

MB_Forever

Mercedes/AMG used to recommend 0W-40 for all their 63 engines, but in May of last year, they issued an update to take the 63 off the 0W-40 and put them on the 5W-40, which is hard to find in the U.S. I don't know why they issued the switch

Jon2007E63P30

No, not true.

If the dealer put in 10W-40, gi back and ask why they are not putting in the recommended 0W-40 or 5W-40.

If you put it in, then it gives MB a reason to reject an oil related failure under warrantee.

As for any specific damage to the engine, unlikely.

nismorg

I would imagine they switched to 5/40 to give it better protection during cold starts as it would build a thicker layer of oil b/w the bearings and less oil blowby/Burn.

Vivo

If the 0,5 & 10 are no's that determine cold temp viscosity then I should have no prob's as we rarely go below 70 degrees where I'm from. I will, however, confront the dealer as to why they used 10W40, instead of that recommended by AMG, as Jon suggested.
Thank you all.