Good evening guys!!
i'm from indonesia. i have a friend that has a problem to solve. i hope some of you guys have experience in solving it. In a site in Palembang, there's many logging industry. And almost all of them have problem in lubrication for their trucks (most of them use japanese truck which operated in severe heavy load, off-road,and very humid atmosphere). And many complaint from operators that using the sae 40 causing overheat. I suppose it comes from the severe load they carried. Is it okay to switch to sae 50? is there any technical explanation and justification for that step? Or maybe using oil additives is the ultimate solutions? thanx.