I had an SR in a 240sx for years here in the U.S. and I had one in a 180sx in Japan for a year too. When it comes to an SR, you want a oil press guage. If you don't know the dude you bought it from and you want to make sure nothing is fishy, watch your oil pressure. Normal pressure at a warmmed-up engine idle is about 30 psi. If the SR has no oil pressure, you better get ready for a rebuild, because the oil squirters are blocked up and the longer you go with little or no pressure (10 psi and less) the quicker your block will sieze. You can pick up a cheapo manual one at auto zone or checkers/kragen for like $30-40.