Recommendation on motor oil.

[Miguel Mathis]

Could I get some of the most recommended types of oil to use when changing my oil?  I have  a 1991 Brougham with 127,000 miles a 305 motor. Thank y'all I appreciate it. I'm due my first change since buying the car.

[Dave Shepherd]

Any top grade 10/30 oil will work.

[EAM 17806]

Any top grade 10/30 oil will work.

Specifically, what top grade brand 10-30 oil are you referring to in your opinion; conventional or synthetic brand names?  Would you include Wolfs Head conventional or synthetic motor oil?  EAM

[Dave Shepherd]

Wouldn't that be the owners choice, there must be 10 satisfactory brands with the necessary  SAE and API ratings.

[Miguel Mathis]

Thank you. I was wondering about synthetic versus regular

[Carl Fielding]

There are three logical choices. SYNTHETIC , SYNTHETIC , SYNTHETIC. A very synthetic FULL synthetic. Mobil 1 or better . I use Amsoil , but want to find out more about the relatively new Penzoil synthetic made from natural gas. Synthetic. Easier on your engine , and cheaper too due to extended oil changes. Synthetic.  - Carl

[cadman56]

I have used Phillips TropArtic 10W30 in all my cars for decades.  My 91 Brougham 305 went 197,000 miles before I installed a new GM crate engine with a new transmission. The old engine did not smoke or rattle.  Just changed it out with the new transmission.  Still using the same oil now.  Larry

[Carl Fielding]

Apparently synthetic oil is so good that Cummins gave a huge extended warranty to operators of their commercial diesels if they used synthetic oil (that with extended change intervals , and an accessory bypass filter). Maybe I am trying to say , I would rather run an oil which gives 600,000 mile service life in my engines and transmissions , than 200,000. Cheaper between changes of both oil and machinery. Oh , yeah : what is a free overheat margin buffer worth ? I think I would actually pay more for that. But free ? Seems like a no brainier to me ! With respect , I don't know if there is something about synthetic oil that some of us don't understand ? I know that some of us have so much money that wasting it is not an issue , but the wealthy people I know seem to enjoy getting their money's worth. Oh , well. Hosses : I have led you to the water. S-Y-N-T-H-E-T-I-C for the sake of your machinery and wallet.  That boring old fanatic , Cadillac Carl

[Miguel Mathis]

Thank you Carl very insightful. Thank you.