'67 Cougar, 289 CI oil.

[TXCarGeek]

Any consideration for M1 Classic 10W30? Saw it at autzone a couple weeks ago and thought that it would be a good oil to try in my M117 powered Mercedes 560SEL at some point.

 

[tsp]

I’m using it in my 1965 Mustang w/260 V8. No issues.

 

[Randy_R]

Use it. It was made for flat tappet motors. I’ve used their 10W-30 on my Chevy 350 for years, original Brad Penn and the DA product, Penn Grade 1. Summit sells 5 quart jugs about $36. Buy 3 to get free shipping. Mobil 1 Classic good too but $$$$. $12-13/quart way much but synthetic. Walmart sells 5 quart VR1 conventional $27. 67-68 Cougar great looking car.

 

[SC Maintenance]

I would use it. Dad put a lot of miles on a 71 302 in a F100 when I was a little kid. Worked it hard, hauling too much pulling too much. Never had an oil problem with whatever oil they were selling in the 80’s and 90s. I think it got parked when I was in college in the mid 90s because it finally rusted completely away. I think it still ran.

 

[OVERKILL]

Use it up. Once it's gone, switch to a Euro 0W-40 or 5W-40 like M1 FS 0W-40, Windsors aren't hard on oil and yours sounds extremely mild. Another option is Delvac 1 5W-40, if that's easier to get (but I doubt it).