Australians wanting to use a full synthetic from Mobil or Pennzoil have one choice of viscosity - 5W-50.

Consider the following-

Eighty percent of our population live in a mild climate on coastal plains. Winter lows of 10 degrees, summer highs of mid to high 30s. A climate with no extremes.

Does the above warrant 5W-50 ?

Pennzoil's website states - 'SAE 5W-50 is formulated to give a thicker film at higher temps,SAE 5W-50 does not meet passenger car requirements for fuel economy'.

Am I correct in assuming the same applies to Mobil 1?

My research has indicated that if an engine is in good condition it can be harmed by an oil that is too thick? Higher than normal pressure may blow gaskets, and increased drag may result in increased wear.

The disadvantages of buying Mobil 1 or Pennzoil Synthetic in Australia would appear to be-

Increased wear,

Possibility of blown gaskets,

Reduced fuel economy,

Reduced performance,

Concern that you are disregarding the manufacturer's viscosity recommendations for all owners of passenger cars sold in Australia &

A reduced bank balance.

The advantages of buying Mobil 1 or Pennzoil Synthetic in Australia would appear to be -

NIL for the motorist.

I'm hoping someone out there can convince me that using the oil I've got stored, 2 x 5 litres of 5W-50 Mobil 1 costing $100, will be in the best interest of my 93 945 b230ft.

Should I keep using it or go to a blend such as Mobil synthetic blend that has a 15w-50 weight?

Can someone try to explain Mobil & Pennzoil's thinking?

Your thoughts will be appreciated. Thanks in advance.

Take care,

John H from DOWNUNDER