oil

[hucks 50]

what oil are you guys running in the engine .10w40 15w 40 5w30 what would be better ,or what is the correct oil mine is a 50 dodge wayfarer

[BobT-47P15]

I like Valvoline 10W-40. Or 10W-30 is also OK.

Others have their preferences.

[Young Ed]

10-40 is what I have in both mine.

[aero3113]

Hows your oil pressure? I run castrol 20w-50 and some lucas oil stabilizer. works great.

[Dennis Hemingway]

I run castrol 20w-50 in my 48 P-15.

Dennis:cool:

[48mirage]

First let's assume you are not breaking in a rebuilt or new motor.

Second, any modern oil is much better than the oil made when your car was new.

Your original specifications probably called for a straight 30 weight oil. Since you live in Illinois you will see warm summers and cool winters so you may want to evaluate the period when changing oil.

Multi-weight oils i.e., 10w-40 is a 10 weight oil. It has elastomers added to it that give it the characteristics of a 40 weight oil when it is brought up to operating temperature. Basically these elastomers act like thickening agents. A 40 weight oil at temperature is still thin, but thicker than a 10 weight oil at temperature.

Another thing you need to consider is how much wear you have. A thicker oil will serve your bearings better than a thinner oil. A thinner oil will also find those leaks you may have a little faster.

Price. What do you want to spend? I buy the WalMart straight 30 weight for my '49 D30. I have some minor leaks and 71,000 miles on the motor. I maintain 40 to 60 psi during normal driving but it will drop to 20 psi when idling on a hot day.

There are those that will swear that the WalMart oil is used oil that is re-refined. So what. I used to work at a Texaco Refinery, we accepted used oil, sent it to the coker unit with other feeds to seperate the different hydrocarbons. There is no way that you can intorduce any "problems" with a re-refined oil. In fact I challenge anybody to show me the difference between a molecule of re-refined oil and "virgin" oil.

Additives: I do use the Lucas oil stabilizer, I think it helps with the wetting of parts and use it in my engine, an antique HD, the transimissions and the differential of my Coronet.

You are best served in finding the oil you are comfortable with, keeping it clean (filtered), and changing it regularly.

Other than that this discussion is a lot like politics. We all have opinions on the virtues and vices of the different choices and we have to decide for ourselves which one serves our needs.

[claybill]

i just changed all 4 cars with rotella 20-40.

is it possible that oil pressure will change due to an oil change...OR using different oils? lets say tho, same or similar weights.

bill