Originally Posted by radbushi
The dealer here in Redding CA said they charge $8.00 a quart if you have it changed there. Also in 0W-40 the W stands for winter and has no rereance to the 40 just some food for thought. So for a good deal on an oil change bring your SRT to Redding
Yes, the W means winter or cold temp range and the higher number is the relative viscosity index of the oil at 100 degrees C but there is a range within those weights. A formulation of 0W-40 will flow faster at high temp than a 5W-40 or a 10W-40 even though they all meet the 40 high range. I doubt the engineer would have made the statement they did or taken the time to formulate a 0W-40 when their vendor, Penzoil, already had a good 5W-40 if there wasn't a performance advantage.