'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).

 

[Randy_R]

Ill just use the same Castrol synthetic 10w40 i use in my 390 Mustang, will use up the non graded oil in my tractors

It’s not tractor oil. Use in the Mustang, too

 

[Hohn]

No cam card, it is fairly stock by the feel if the engine, not lopy, feels stock to me, nothing like my 68 street fun car.. Has the stock stamped style rockers, as I pulled the valve covers to replace with finned aluminum. I would not imagine there are anything other than stock springs.

A 289 will lope early, so if you are getting a smooth idle, it’s safe to say this is in the 260 or less advertised duration range— near stock.

 

[Zack1978]

I like the Penngrade oil, but it is so expensive. It seems the Amsoil Zrod is a better choice given the price.