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#1
08-11-2008, 09:58 AM
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Going from a 10w-40 to a 5w-40
Are there any issues with going to a different weight? My car is a '98 210.606, driven regularly in Central Texas. Thanks.
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#2
08-11-2008, 01:21 PM
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On general principals in your temperate climate I would not. There may be no scientific basis for this. Most of the year even this far north I still like a 15-40 in a diesel.
I feel that if the low viscosity makes it far easier for a metal on metal situation occuring and if it were to occur the engines lifespan is drastically reduced. The oil has to remain on friction areas. The pressures involved to reduce the oil film thickness are very strong in a diesel to start with. Remember as well the by products of combustion build up in the oil the viscosity can be even further reduced with useage.
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#3
08-11-2008, 02:09 PM
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AFAIK that weight is on MB's spec sheet for that engine.
__________________
1999 SL500 1969 280SE 2023 Ram 1500 2007 Tiara 3200
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#4
08-11-2008, 02:48 PM
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the "5" in 5W40 stands for it's viscosity at 0°F in relation to known lubricants. it's the "40" in the lube that is important, and it will be JUST AS THICK at 110°F as the 15W40 will...
and you will have the added benefit of smoother starts in cold weather and longer oil change intervals. with a better protected motor.
__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!!  1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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