When to use 5-30w oil?

Why are slow speed diesel engine referred as cathedral engines? Can a dirty air filter cause your car to jerk? Where can I get a diagram on a 2001 Chevrolet Impala intake manifold? Does constant downshifting when accelerating from a stop and downshifting to a stop harm an automatic-transmission over time? What is the obd code p0340? Why does emergency brake light on dash stay on when emergency brake is off? How do you jump start a 1999 c230 without accessing the battery? Why a car with a catalytic converter still produces pollution? What Fram oil filter fits a Ford 1300 diesel tractor? Is it a leak in your brake line if your brake light came on and went off after it was topped off then happened again a few days later and how much to fix? How do you reset the check engine light of Mazda bongo truck? Why is there oil of the spark plug of your weed eater? Where is the oil pressure switch located on a 2003 dodge ram 1500 4.7? Where is the crankshaft sensor on a 2000 Chrysler Sebring convertible 2.5 engine? Where to buy auto ac compressor parts ie shaft seals gasket kits and complte rebuilt kits? How do you change a front turn signal on a 2008 GMC Yukon? P reg vectra when you turn the ignition on a light stays on the dash it has a picture of an engine with a bolt of lightning in it what does this mean? Where is the Crank Position Sensor on a 1995 Chevy Cavalier and what does it look like? What is the oil capacity of a holden barina? Bas battery or bad starter?