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Re: Are Mobil & Pennzoil Misleading Australians? ALL 93

posted by  someone claiming to be Steve Ringlee on  Fri Jul 6 02:55 CST 2001 [RELATED]

I know Pennzoil uses a hydrocracked Group III base oil in its US-based "synthetics", blending VI improvers to give various viscosity grades. Castrol is the same. Mobil uses exclusively Group IV and V full synthetics (as do Valvoline, Redline, Amsoil), again blending VI improvers to yield various grades. The 10-30 has minimal VI, the 15-50 more.

Volvo does NOT recommend a wide viscosity range such as 5-50, and you are better off with a 10-30 year-around in AUS unless you are in the deserts. It would be interesting to know why they blend such a range for AUS instead of producing normal 5-30/10-30 or 10-40 grades. BMW in the US specs a 5-40 for its cars, based on a full synthetic formulation made, I believe, by Mobil.

The disadvantages of high viscosity oils are poor fuel economy, greater shear at operating temps, reduced cooling capacity, and use of more viscosity improvers which do not add lubricating qualities.

See the FAQ for more information on oils.





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