10W40 or... 10W50?!

I use credit for everything. Right up to the due date of our credit cards. Then we pay them off in full.

Arbitraging on the banks is an unalloyed pleasure!

An implicit interest rate of 20% p.a. on one's money is not to be sneezed at.
Of course, it is horrible if one is paying it ...
 
I live in the bank country but I only use cash....I don't even have a credit card ! Sorry, off topic !
 
Just changed oil used Febi 5w40.
 
Ratbag said:
Ben, there's an awful lot of BS on the internet ... but I'm sure you already knew that!

Here's a simple explanation:

Motor Oil Viscosity Grades Explained in Layman's Terms

Motor oil viscosity grades and how they are selected. What do they mean and why is it important?
www.upmpg.com

I'm rather careful about keyboard bounce when typing 'FS' = Fully Synthetic.

FS oils are far tougher than mineral oils. A mineral oil has a lifespan of about 6 months or 10,000 kms in a working engine, whichever comes first. The Shell Helix Ultra in both our Foresters has done nearly 3 years and 10,000 in one and 20,000 in the other. In both, the oil still looks good (slight discolouration), feels like new and smells good (like new smell, no slightly burned smell).

Some modern European cars come with an oil analysis system. Some of these are showing that the FS oils are still fine at over 2 years and 23,000 US miles. Much better for the environment, and better to recycle.
Click to expand...
Thanks John - excellent explanatory article!
 
Another article on that web site looks at the causes of oil deterioration:

Why Does Motor Oil Deteriorate?

In depth explanation of the chemistry of motor oils and why they deteriorate.
www.performancempg.com

And info from Shell about the Helix Ultra oil:

www.shell.com.au

Shell Helix Ultra 5W-40 | Shell Australia

Fully synthetic motor oil – Shell’s most advanced formulation for high-performance engines.
www.shell.com.au www.shell.com.au
 
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