What is the thickest oil you've ran in the winter?

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I grew up next to Lake Erie in Ohio and had a 73' VW Beetle during my junior and senior years of high school in the 90's. I ran Castrol 30W year round.
 
Ran some mineral Quaker State 10w-40 in my old '91 Stanza in northern NJ back in the mid 90s.

Fast forward 20 years, and I'm still running 10w-40, although it's synthetic this time.
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Originally Posted By: bdcardinal
5W50 but I don't think winters here really count.


+1, but ran it during Canadian winters in my 98 Sienna. Had no issues.
 
GTX 20W-50, Edge 10W-60 and Penrite 20W-60
But my Australian winters don't count, they are fairly warm.

The thinnest oil I have ever used in summer is the oil I am using right now, M1 5W30, my very first ILSAC oil. I know !!! .... Just call me Tig2 (meant as a compliment)
 
Valvoline Maxlife blend SM 10w40 in the "winter tank" 97' Bonneville of mine few years back when it was -12F for 4 days
 
Shell Helix 25W-70.

didn't get below -8C (about 20F)...nothing blew up.

Time to full oil pressure didn't change. On the J Car engine, you could see the cam oil holes, and it "flowed" just fine.
 
Mobil 1 10w40 HM in the 1970 Beetle right now, it's had it for 19 months or so.

Had MaxLife 10w40 in my 96' Chevy pickup with a 350

But this is Phoenix, it gets to 30 occasionally.
 
20w50 in a $400 saturn in March with overnight lows in the teens.

I got it on clearance and was using it as a flush oil as the previous stuff was tarry and nasty.
 
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