Thank you for the welcome. I had to learn the "hard way" running commercial equipment for 22 years. Finally gave up on listening to idiot salespeople and got the Big Book Of Instructions straight from the horses mouth. I was just refered to this site from the GM Trucks forum by an Amsoil dealer there. I'm happy to have joined!
Although the SAE J300 test has basic requirements for a 5W-x and a 0W-x, these are "ballpark" and only real MRV BPT testing will tell you what the oil is capable of doing. For example, Mobil markets a 0W-30 in Europe that meets the new VW 506.x requirement: it's pour point is -39 C and the BPT is -34 C. That wouldn't work very well where I live.
Regarding your woman's Audi, I'm not aware of any 10W-30 oils that meet the VW-Porsche-Audi service spec. Maybe Mobil 1, but their 10W-30 has a BPT of -42 F so it should have been fine at -5 F.
For your sake and happy matrimony, I also hope you didn't bugger it up, the couch is a cold and uncomfortable place to spend the winter!
Well, maybe the cat can snuggle up and keep your footsies warm!
I don't pay attention to "pour point" as it has no relavance to lubrication. Due to the extreme cold temps here, I only look at what the MRV BPT rating is: the lower the better.
My 2000 GMC Sierra with Vortec 5.3 appears quite sensitive to an oil's BPT, which is why I use Mobil 1 0W-30 in winter. I figure the slight increase in wear resulting from the lower HTHS is MORE than made up for in better cold wear protection: instant oil pressure at -42 F.
I use Delvac 1 in my commercial equipment and even at -42 F, instant oil pressure. Have to like that!
Jerry
quote:
Originally posted by TSoA:
heyjay, how can you bea junior member and know so much? This is my third winter in northern PA where low winter temps has been an issue. I learned a lesson last week when my woman's I-5 Audi with 10w-30 froze up good at -5 degrees. I used a hill and push-started it, tough to spin the engine but it started...hope I did not damage it. A total novice scale I made up for idiots is "don't use a (multiweight) oil at temps below what the w-rating says", for example a 10w should not be used under 10 degres F and so on to a 0w oil at zero degrees F seems to reflect what happens anyway. Not many car owners are as knowledgable as you, and are slow to comprehend anything more basic than I discribed ...duh... centipoise?