u/Kingyeetyeety

So I work in auto parts and every now and again I'll get a mechanic who's old AF and dies on the hill that HM vehicles need to use "thicker" oil to keep running. When I ask about this they will just say that's how it's always been. No one really cares to explain as to why!

When I ask the usual "is your car burning oil?' or "do you have a leak?" They say there's no problem but that because it's HM it needs it.

I just had someone the other day use 10w30 syn in a newer yota that called for 0w20. What are your thoughts ? Anyone out there with this line of thinking that care to explain ??