This engine is known to be prone to sludge with lengthy oil changes. I change the oil around 5000 miles. Vehicle is almost 100% short tripped. 1-20 mile drives. It's always started and either accelerated immediately or having an occasional long idle after start. It's starting to get cold here in Ny and I probably wont change the oil until it gets warm again. So basically I am looking for an oil good for cold starts and immediate moderate acceleration to 4000rpm. I have been using mobil1 5w30 high mileage. I recently replaced the valve cover gaskets and there is no sludge under there. Also the car does not use any oil that I can tell. The level on the dip stick stays full throughout the 5000 miles. Car has about 160,000 on it. Thanks. Ps: I'm not the driver. Someone with no knowledge of automobile function is. I just maintain it.
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