Thread: Oil. Why should I use
View Single Post
Old Oct 4, 2012 | 02:12 PM
  #69 (permalink)  
onehundred80's Avatar
onehundred80
Senior Member
Joined: Apr 2006
Posts: 25,432
Likes: 650
From: Ontario
Default Re: Oil. Why should I use
Originally Posted by Motostar
Another way to gauge this in my view, excuse the pun....all things being equal you know you have chosen a good viscosity oil for your environment when oil pressure stabilizes quickly, start up to operating temp fluctuations are expected.

regads
The pressure may stabilize but the pressure could still be to high as the oil is too thick.
Using a 5W50 oil is not too smart as 50 oil flows like 50 oil at 212 deg F at 190 deg F it will flow like a 50+ oil grade.

The 5W means it flows less than a 0W oil at the same temperature, the 5 does not mean SAE 5, it flows much worse than a SAE 5 oil.

Stick with the 0W40 and you are better for it. 5W50 is bound to have higher pressure because it is thicker and there is less oil being moved because it is harder to push. But that has escaped some people.

A quote from the article listed below.
'The fact is that a 5w30 motor oil is thicker in cold temperatures than in warm temperatures. In fact, you could easily demonstrate this for yourself. Have you ever tried to pour oil out of the bottle in the winter – even a winter rated multi-viscosity oil? It pours more slowly, doesn’t it? That’s because the cold temperature “thickens” the oil.
However, a 5w30 motor oil will be thinner than a 10w30 motor oil when subjected to the same low temperature conditions – because the “W” number is lower. This is an indication of better cold weather performance. In other words, a 5w30 flows better in cold weather than a 10w30 motor oil will. Think of the “W” as a “winter” classification instead of a “weight” classification.'
 
Reply
0