Originally Posted By: Shannow
Originally Posted By: tig1
If you would re-read all the post of mine then you would realize Shannow was the one that responded to my comment about using M1 5-20 in 1978. You have it just backwards.
Same as every time...you use the "I used 5W20 in 1978, switching from 10W40"...THAT is where I step in.
As I have stated, over and over and over, the original M1 5W20 had an HTHS (actual bearing protection) comparible to a (poor) 10W40 of the day, which is EXACTLY why Mobil stated that it protected just as well.
And the HTHS of THAT M1 oil would be the same as Redline's offerings today, or an ILSAC 30 grade.
You may discount HTHS, but your engine doesn't...that's why it was researched...why the multigrades of the day were so useless at protecting things compared to their grade.
the M1 that you used then (when CAFE existed. and was implemented) was built entirely differently than modern oils, and yes, Mobil advertised it also for economy...
Yes you used it, yes you got good results, is it relevent to the push to 0W16s (might I add, the TOPIC here is 0W-16...you are always dismissing my comments as not on topic)...not a jot.
Sorry to disagree with you, but I fail to see your point. Todays M1 5-20 has a HTHS of 2.75. You say M1 5-20 of 1978 was 2.9( If you are correct). What real difference is that? None that one could tell by performance. The real difference was dramatic at the time I changed to M1 5-20 in 1978 from Valvoline 10-40. HTHS numbers are still not relevant today for me. If they are to you that's fine.
