5W-30 vs. 10W-10 Oil (Valvoline Synthetic)
07-05-2009, 03:12 PM
#1
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Join Date: Mar 2006
Location: Rixeyville, VA
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5W-30 vs. 10W-10 Oil (Valvoline Synthetic)
I have always preferred to run Valvoline oil, and when I bought my '97 I settled on running Valvoline again. Mainly because back in the day, the motors we tore down that ran Valvoline were the cleanest.
I picked up a 5-quart jug of Valvoline Synthetic at Wal-Mart last spring, and it's been sitting on my shop shelf for my next oil change. It occurred to me that the oil cap for my LT1 indicates 5W-30 -- not 10W-30 that I usually grab. Question: what (if any) downside is there to running the 10W-30 oil? I rarely (if ever) drive the car in the winter. It's mainly run from April to early November. I can probably swap the jug for 5W-30 if need be.
Comments are requested.
I picked up a 5-quart jug of Valvoline Synthetic at Wal-Mart last spring, and it's been sitting on my shop shelf for my next oil change. It occurred to me that the oil cap for my LT1 indicates 5W-30 -- not 10W-30 that I usually grab. Question: what (if any) downside is there to running the 10W-30 oil? I rarely (if ever) drive the car in the winter. It's mainly run from April to early November. I can probably swap the jug for 5W-30 if need be.
Comments are requested.
07-05-2009, 07:18 PM
#3
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Join Date: Feb 2004
Posts: 4,800
If you look in the owner's manual I believe it says 10w-30 is fine down to zero degrees.
As already stated it is still a 30weight oil at operating temps it is not necessarily any thicker than the 5w-30. I have seen some brands where the 10w-30 has actually been thinner at operating temps.
As already stated it is still a 30weight oil at operating temps it is not necessarily any thicker than the 5w-30. I have seen some brands where the 10w-30 has actually been thinner at operating temps.
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