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5 - 40 will be better than 10 -40 because it will give you better protection at start up but it's the "40" figure that affects your oil pressure when the oil is hot.
"Oilman" on here has posted lots of good stuff on what oil to use but iirc there's no point in using oil higher than 40 unless you flog your car around a track. A 50 oil will give you higher oil pressures for the same oil temperature but that doesn't mean you'll get better protection, indeed the oposite may be the case. Good quality oil is more important than worrying about a few bar of oil pressure!
John
I read all posts about oil what Oilman put in forum...
very very good text, and you can learn lot of oil - it's whole knowledge ...
after that text about oil I decide to use 5-40.
that is true - high quality oil is much important...
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