because i had nothing better to do.
for every one person that could actually give a good answer, there are 40 other people ready and waiting to post about how they used xxx oil and it was great because it picked up oil pressure.
Yet what they don't know is there engine needs ZDDP in the oil to protect the cam. or they've just lost fuel economy because the oil pump now has to work harder to pump the oil, most of which is now being pumped straight out of the pressure bypass straight in to the sump.
Or that the oil has piss poor shear strength, so every time you bring the revs up the oil breaks down and you wear the bearings or scuff pistons.
How many of you running thick penrite have actually put a good pressure gauge on the engine and TESTED the oil pressure?
if the oil pressure is within spec with the thinner oil, why the hell would you waste money and fuel and risk damage to your engine by using an oil that is far to thick.
How many of you have stripped engines after years of use running these oils?
I've seen an engine with over 300 000km using 15w40 Valvoline XLD (cheap yet very good oil, do a search on oil testing, this oil out performed supposed industry leaders) that when stripped showed almost zero bore wear and NO crank journal wear. very minor scuff onthe pistons. the engine was given rings and bearings, the crank grinder didn't see a reason to touch the crank at all.
I've also had the pleasure

of stripping and rebuilding engines that have been treated to the wrong oil. glazed bores massive bore tapper, scored cranks, pistons that feel like cheese graters.
But the customer swore he used the good stuff, nice and thick too.
like i said befor, if you are that keen to learn, a 4X4 forum is not that place to do it. use google and spend a few days looking, It'll take that long to get through it all.