Originally Posted By: tig1
Originally Posted By: Ben99GT
Originally Posted By: OVERK1LL
That's like my dad. First thing he said was "wow, that is a LOT quieter", and I hadn't mentioned that it was going to happen.....
I do think M1's 40 weights are the best oils in their lineup.
I disagree with that . Their 40wts are great but for the purpose they are designed for. I've used M1 oils for 31 years and their all very good for thair purpose. You can make a noisey engine quiter with STP or other oil thickeners. Both of my Fords are very quite with the 5-30. How quite? I can't even here the engine in the Fusion outside the car.
I would be willing to wager they would be notably quieter with Red Line if you aren't deaf. Regarding thickeners quieting an engine, RL 5W-30 is actually thinner at temp than M1 5W-30. I believe M1 0W-40 and M1 TDT are better overall formulations than their generic GF-4 20 and 30 weight siblings, which are nothing particularly special these days, IMHO.
And before you go on defending M1 5W-30, remember that I'm the guy that posted these:
http://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=1564814&page=1
I'm a long time M1 user myself.