Originally Posted By: buster
There are a few things I really like about this oil.
It's cold weather pump-ability is outstanding. It meets the latest, most demanding high temperature specs and has a HT/HS of 2.7. dexos 1/ACEA/(previously met GM 4178M).
FWIW, the SN M1 doesn't have the internet based claim of increased engine noise. In fact, the SN actually appears to make engines a tad more quiet. Again, just internet observation.
Funny you mention SN vs SM. I used m1 5w-30 when the spec was SM and every engine I used it in was noticeably more noisy. The top end clacking and tapping so last winter I was expecting the same,or worse using AFE in my 04 hemi.
There was absolutely no more noise than the PP that the AFE replaced. I did hear a slight knock,similar to a Diesel engine coming from the bottom however that noise was there when I got it,and PP nor eneos 0w-20 had any effect on it whatsoever.
Once spring hit I had a jug of 5w-20 defy and that cured the dieseling sound from the bottom end.
Trust me. I looked for reasons not to like AFE and listened to my engine with a heightened sense of hearing so I could bash the oil but I found nothing to bash. Truck ran great,started easy at -35,I towed a fox body across the prairies on a trailer with it and the oil showed absolutely no signs of any of my previous experiences with M1.
So buster I noticed the same thing you mention,the SN spec seemed to have done a bit better with any noise or acoustics coming from an engine.