Good Morning;
First, to Dr. T, & J - sorry I flamed out on you in my recycled oil post. Bad day...
So here's the question (I've asked it before, but not as directly): is there any point to dino 5W-30? From all I've read on here it shears down to a 20wt quickly due to all the visc improvers it needs to meet the spec. Sounds like a lot of varnish/sludging potential to me.
Does it offer that big of an advantage at startup over 10W-30 at low temps (like 0-30F)? Big enough to make the shearing worth it?
Does anybody have any experiences (good or bad) with running 10W-30 at low temps?
Seems like if you think you need a 5W-30 because of the temp (less than 0F) you might as well use a synthetic for the winter. Or a well constructed 5W-20 since that's what your 5W-30 will be anyway?
I would have never thought to ask the question except that my Chevy with a 3.4 pushrod V6 calls for 5W-30 year round, while my Volvo (made in SWEDEN, where its COLD) with a DOHC engine calls for 10W30 in temps down to -4F. Having a hard time seeing where that makes sense.
So why do we even have dino 5W-30? CAFE strikes again?
Matt
[ May 08, 2003, 10:17 AM: Message edited by: Matt89 ]
First, to Dr. T, & J - sorry I flamed out on you in my recycled oil post. Bad day...
So here's the question (I've asked it before, but not as directly): is there any point to dino 5W-30? From all I've read on here it shears down to a 20wt quickly due to all the visc improvers it needs to meet the spec. Sounds like a lot of varnish/sludging potential to me.
Does it offer that big of an advantage at startup over 10W-30 at low temps (like 0-30F)? Big enough to make the shearing worth it?
Does anybody have any experiences (good or bad) with running 10W-30 at low temps?
Seems like if you think you need a 5W-30 because of the temp (less than 0F) you might as well use a synthetic for the winter. Or a well constructed 5W-20 since that's what your 5W-30 will be anyway?
I would have never thought to ask the question except that my Chevy with a 3.4 pushrod V6 calls for 5W-30 year round, while my Volvo (made in SWEDEN, where its COLD) with a DOHC engine calls for 10W30 in temps down to -4F. Having a hard time seeing where that makes sense.
So why do we even have dino 5W-30? CAFE strikes again?
Matt
[ May 08, 2003, 10:17 AM: Message edited by: Matt89 ]