I switched to Penrite synthetic oils back in 2006 after reading a lab test published in the Commodores magazine reviewing 18 different oils available in Australia . On the strength of its reputation I had been using Mobil 1 since starting to do super sprints back in 1997. By 2005, however, I had twice experienced oil or compression ring problems in my Skyline R33 so went researching oils. The review I refer to above suggested that Mobil 1 was in fact one of the poorer performing oils in the stress tests carried out while Penrite was number two on the list of 18 and the difference in quantified results between the best and poorest at that time was huge. Since changing over I have always had great performance and engine reliability from Penrite though I did find that the higher viscosity ratings (say, 10-W70) could produce a bit of piston slap for a couple of seconds during cold starts in my modified Nissan Stagea. This prompted a bit of experimentation and of the viscosity ratings I tried, the 05-W40 solved the issue. Nowadays I use Penrite in both my MY12.5 Calais and my E46 330Ci BMW - I have had nothing but quiet, smooth performance in both cars.
I changed to this oil recently from the synthetic Valvoline 5-40 I had previously had in the car. I have to admit that my car is quieter on Penrite.I couldn't believe the difference. I have always been sceptical about oil companies claims. This one has changed my mind. As for the longer term I will have to wait and see .
Good drop but
Changed over from the castrol edge 5-30 normally purchased as the price savings seemed a little too good to ignore. Oil stays clean and all the performance is still there but does run about 10c hotter in both my xt forester with 90k and hsv senator ls3? Is this somthing that I should worry about??
Lasts longer than most other oils
I have found this oil last longer before it breaks down. As i have an oil pressure gauge i can notice as soon as the oil starts to break down. Most other oils only last approx 5000kms this stuff will last 10000+kms. I also notice that my fuel consumption is effected once the oil breaks down in other brands. With the HPR5 it doesnt change through the life of the oil.
Good life span and fuel economy
Costs a little more, not too much though
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