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Synthetic is very thin and slippery, It gets past worn valve seals. Don't put synthetic is a old motor <img src="/forums/images/graemlins/shame.gif" alt="" />


Viscosity is viscosity. It is true that Mobil 1 oils are on the thin side, but you can always just get something thicker like a 5W40.

I think it is a myth that synthetic oil causes seal leaks.

'90 Montero XLS (Sold, sadly)
'95 Montero LS 160k
'03 Montero Limited 30k