Oil Question

[RedEuro]

Are there any potential issues with running a 5w-40 in my 98 100 series?

I was just curious as I have a 5w-40 in 55gal drums here at the shop. It would save me a little time and effort if I can run the 5-40 instead of the 5w-30

TIA

 

[9toys]

It'll just use a fraction more gasoline. one of my work partners uses 20w-50 for some reason in his lexus that has 150k miles. can't imagine why he does it but he swears by it.

 

[NMuzj100]

Several people on the board run it with no issues. The engines was designed with 30w in mind but 40w isn't much of a stretch.

 

[9toys]

wife's SLK calls for European formula 0W-40. Can't imagine what difference it makes...other than outrageous price...especially at 8.5 quarts.

 

[rusty_tlc]

Maybe one of the smart people can edjumacate me on multi-viscosity oil.
I thought the whole idea was that they act like a lower viscosity at cold temps for easier cranking and higher viscosity at warmer temps for better lubrication.

 

[kyoso23]

As long as you don't live in a really cold climate, it shouldn't make much of a difference.

 

[LCHardriver_02]

What is considered REALLY cold? 0 degree? -50 degree? Arctic tundra keeps getting stuck in your wheels?

 

[NMuzj100]

What is considered REALLY cold? 0 degree? -50 degree? Arctic tundra keeps getting stuck in your wheels?

The real benefits of the 0w over the 10w are at -10 degrees F and lower.

But you really can't get too low on the cold side because it will still be way thicker than the hot side at operating temp. With modern oils there is not really any down side to a lower winter weight and the way the standards are written the same oil could be labeled 0w-30 and 10w-30.

The Euro 0w-40s are good oils and you really pay for it.