quote:
Originally posted by Pablo:
Patman -
I have no concept who was the first to sell 0W, but when I started hawking the stuff, no one would even stop laughing. So, I guess I'd also like to know truthfully whom had it for sale first...legends have the frostbacks using it first (makes sense) but other legends have racers using it first.
I first became aware of the Mobil 1 0W-30 in Utah of all places. The local Autozone's started carrying it, same in Nevada. Since I've never seen colder than 4 F in Utah, I wondered what was up with that.
The only reason I use Mobil 1 0W-30 is the extreme cold winters I have to live in. We have hit -42 a few times, and the MRV BPT of M1 0W-30 is a healthy -58 F.
My application is a 2000 GMC Sierra pickup with the Vortec 5.3 V8, essentially an LS-1 motor but with iron block.
I've kept careful track of oil consumption, and I average about 4,200 miles per quart on 0W-30 and about 6,800 miles per quart on M1 10W-30. On average, the motor works much harder when filled with the 10W-30, since I tow from 7,200 - 9,000 lbs in summer.
When very cold, the Mobil 1 0W-30 provides almost instant oil pressure and none of that clatter and knock I used to get with the "regular" 5W-30 it came with.
However, when the temps warm up, I notice a LOT more noise from the motor at operating temp. Say the ambient is +10 C or higher, I hear a lot of "ticky ticky" valvetrain sounds that I just don't hear with Mobil 1 10W-30.
The HTHS rating of M1 0W-30 is 2.99 mPa s @ 150 C, of M1 10W-30 is 3.17 mPa s @ 150 C. You'd think this isn't a huge difference, but it IS an audible difference.
Jerry