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What, exactly, does it mean when an oil is labeled "truck and suv"? I see Mobil 1 oils labeled as such, and my local walmart has some Quaker State 10W40 Truck and 4x4 on clearance for $2 a quart. So, what makes this specific for use in a truck? I mean, an engines an engine, right? -Sam

Howdy! I drive a 94 Taurus SHO 3.2 with almost 150k, and have been using Pennzoil Platinum 5w30 and Motorcraft FL400s for the last few oil changes, usually using around a 5-6000 mile OCI. Occasionally on startup, the motor will rev up to around 2-3 grand for a second and I'll hear what sounds...