I run Amsoil Signature series 0W-30 fully synthetic group 4 oil in my car, first thing I noticed was the oil temperature dropped about 8 degrees at operating temp, a little better on fuel, so I reckon it is doing it's job, these oils are extended drain & are supposed to last a year & or 15000 miles under hard conditions, I have done nearly 10K with this oil & it has hardly changed colour, took me awhile to find a supplier it costs about $100 for 5 litres
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