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Until now I have run the Pure One filter #PL14459. Claimed efficiency is 99.9%. An anti drain valve is incorportaed. I do not know the bypass valve pressure setting. Purolator advised this as suitable filter for my Mitsubishi V6,3000cc, DOHV, 24 valve, petrol injected, NA engine. I now find...

I'm new here & just getting the feeling of the website. I hope my question is not a repeat of many before - I could not see a search facility to check this. My question is this: what is the optimum operating oil temp in modern passenger cars, given everyday driving in climates as varying as...