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    Low Oil Pressure - 2005 GMC Sierra 5.3

    Hey Guys … I have survived the cold winter (-10 to +15 deg F) and nursed my old Sierra (150,000 miles) through the worst of it. I did change the oil last fall to Castrol Syntec 5w20 full synthetic. However, as the temperatures dropped, I began to have difficulty in keeping the oil pressure up...
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    Full Synthetic vs HM Full Synthetic

    Looking for advice on which oil to use in my 2005 GMC Sierra 1500 with the 5.3 litre V8. I bought the truck 2 months ago with 140,000 miles (223,000 KM) and now need to change the engine oil. I assume that the truck was run on conventional oil by the previous owner. As I live in Edmonton Alberta...
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