I've got a 93 Geo Metro with the 3 cylinder and I'm looking for some oil recommendations. Right now, I'm running 3 quarts 10w40 Motomaster oil and 1 quart Pennzoil high mileage 5w30, with an oversized oil filter for a Ford V8. I notice in the mornings that my oil pressure light stays on for about a half second after the motor is running, and that concerns me because my motor is rather seasoned, let's say. It's got 258000 km's (approx. 160000 miles). I was thinking of switching to the Motomaster 0w30 oil, it's a synthetic blend according to the label on the bottle, and it's priced at 3.99 a quart. I plan on changing my Motomaster Formula 1 (it was on sale for $1.50!) oil filter to a Baldwin B2-HPG. Due to the motor's overall crappiness (burned exhaust valve I think) and low power output, I have to work it hard sometimes, winding out 3rd or 4th gear full throttle to 4000 rpm's at or so to keep up some speed on the hills around here. Will the 0w30 oil be a good choice, or is there a better oil out there for me?