Is anybody using Mobil 1 extended service 15w-50 and is it OK to use in 70 or 80 degree weather?

 

15W-50 is way too heavy for our engine! If anything, you should go the opposite direction. I'm using 0W-30. Heavier weight oil will make oil starvation at startups even longer.

 

I ran it for about 1000 miles based on a friends recommendation and it was awful. Car started poorly and just did not feel the same.

Went back to 10w30 and car is much happier as am I

 

15W-50 is way to thick.
Cold and warm.
Don't use it.
Your S2000 engine likes xxW-30 oils.
0W-30, 5W-30 or 10W-30.



I'm using a 0W-30 too.

 

5w-40 is another option if you are looking for slightly thicker oil. If that is the case I would think that 0w-40 would be fine too.

 

10 dub thirty crew!

 

Why go away from spec????

Anyone????

I'm not arguing. I just want to understand why people go away from 10w30. I've seen this from time to time over the years and never got a good/straight answer.


-Hockey

 

Hockey Posted on Nov 27 2007, 12:12 AM
Simple.
Oil flow at a cold start.

Look at the 20C column.
The first 4 oils are popular 10W-30 oils.
The number is the viscosity in cSt.
1 cSt = water.
They are all around 160 cSt, some a bit lower, some a bit higher.
Now find the oil I'm using, Shell Helix Ultra X 0W-30.
It has a viscosity of "only" 128 at the same temp.
That's about 20% less.
This also means there is about 20% more oil flow.
(simply put, to make my point, IMO the basic way of thinking is true)
We are still talking about 20C temp.
Look at the lower temps and you will see a lot more difference.

Oil flow is very important.
That is why I decided to "invest" in good true synthetic 0W-30 oil.
My manual was written in 1999, prety soon its 2008.
Oil has changed a lot over the years, lots of $$$$ put in R&D.

 

Target had 15W-50 on clearance for $4.00 a quart.!

Maybe I'll buy some 5W-30 and use half & half. Remember guys I'm in Miami hot hot hot

 

Okay I'm processing this. Nice chart BTW. Does this mean that the lower vis numbers like the Shell Helix would be bad for motors that consume Mobil1 as it is now? Or is that a totally different animal?

Easy on an old-timer - please.

-Hockey