Let me set up a basis for this question.
I have a 2002 LS1 Trans Am. It has ~14,000 miles.
I run Redline exclusively in the T/A.
The GM owners manual strongly recommends using 5w-30 oil and allows the use of 10w-30 oil above 0 degrees F.
I was running 5w-30 for the first few changes until I read a couple of years ago in the various LS1 forums that people were migrating to a 10w-30 oil to quiet their engines. The LS1 is an all-aluminum V8, and because of the hypereutectic piston design, there has been ongoing complaints of the noise from piston slap. The valve train isn’t all that quiet either.
A number of people experimented with 10w-30 oils and felt that their LS1 engines ran quieter.
ALSO, it was being said that GM really preferred 5w-30 oils only because of CAFÉ mileage, and that for high speed driving and WOT runs, the 10w-30 oils gave a better margin of protection.
Okay, so reading that, at the time, I switched to the 10w-30 Redline as a precaution.
So now it’s 2005, and I’m reading information on oils where it appears that thinner oils are better for most engines as it increases oil flow and lubrication across bearings and reduces startup wear.
So this is my question:
On the aluminum LS1, or other modern American V-8 designs, does the use of 10w-30 oil instead of 5w-30 0w-30 cause accelerated start-up wear and less flow & cooling?
Or, {since I'm using top tier brands line Redline} - Are the lubrication properties of top synthetics superior enough that the wear numbers between 5w & 10w are not significant?
Is the 10w-30 a better or worse oil for a car that sees those WOT excursions, but is NOT a daily driver and is NOT operated at < 20 degrees F.
Thanks for reading my long winded question!!
I have a 2002 LS1 Trans Am. It has ~14,000 miles.
I run Redline exclusively in the T/A.
The GM owners manual strongly recommends using 5w-30 oil and allows the use of 10w-30 oil above 0 degrees F.
I was running 5w-30 for the first few changes until I read a couple of years ago in the various LS1 forums that people were migrating to a 10w-30 oil to quiet their engines. The LS1 is an all-aluminum V8, and because of the hypereutectic piston design, there has been ongoing complaints of the noise from piston slap. The valve train isn’t all that quiet either.
A number of people experimented with 10w-30 oils and felt that their LS1 engines ran quieter.
ALSO, it was being said that GM really preferred 5w-30 oils only because of CAFÉ mileage, and that for high speed driving and WOT runs, the 10w-30 oils gave a better margin of protection.
Okay, so reading that, at the time, I switched to the 10w-30 Redline as a precaution.
So now it’s 2005, and I’m reading information on oils where it appears that thinner oils are better for most engines as it increases oil flow and lubrication across bearings and reduces startup wear.
So this is my question:
On the aluminum LS1, or other modern American V-8 designs, does the use of 10w-30 oil instead of 5w-30 0w-30 cause accelerated start-up wear and less flow & cooling?
Or, {since I'm using top tier brands line Redline} - Are the lubrication properties of top synthetics superior enough that the wear numbers between 5w & 10w are not significant?
Is the 10w-30 a better or worse oil for a car that sees those WOT excursions, but is NOT a daily driver and is NOT operated at < 20 degrees F.
Thanks for reading my long winded question!!