: Oil question



thurstb
06-19-10, 12:10 AM
60,450 miles, car had been sitting with little use in 3 yrs. Changed oil, used Valveoline 5w30 Durablend Synthetic.

60,890 miles, oil is DIRTY. should I go ahead and change the oil again? Should I stick with synthetic oil? What are you guys using in your 307's?

Stingroo
06-19-10, 03:11 AM
Check out the RWD FAQ sticky in the RWD forum. There was a HUGE discussion on this which has more info than I could possibly ever hope to put in one post.

What I got out of it is that you need an oil with high ZDPP content (diesel oils, I guess have higher levels), and if you don't have one you can buy and use a GM ZDPP additive.

There was way more to it than that, but yeah. The thread is called "Type of Engine Oil... curious" or something along those lines.

EDIT: Durr, I could just link you. :hide:

http://www.cadillacforums.com/forums/rwd-19xx-1984-deville-fleetwood-1985/180150-type-engine-oil-curious.html

Enjoy :)

thurstb
06-23-10, 11:30 PM
Thanks Sting!:D

Stingroo
06-24-10, 12:45 AM
No problem man. :)

Submariner409
06-25-10, 09:25 AM
Read the linked article and the publication date - all that info is 11 years obsolete. We're at oil designation SM now - SG is gone forever.

N0DIH
06-26-10, 09:36 AM
Every once in a while I come across an oil (I think Autozone) has oil for "older cars", and it specify's a year and older. And if you look, it is oil made to the old spec.

Nice how our government has control of our crankcase oil (managing the ZDDP levels) and gas for the tank (ethanol content)...... WHY? This is area they have no business messing with.... It costs us engines that wear more and last less and engines that get less fuel economy and worse emissions on engines that aren't designed for it, as well as makes some leaner AFR when they shouldn't be (non computer controlled and E4MC/E4ME carb'd cars/trucks)....

sven914
07-02-10, 02:57 PM
^Because as far as the Government is concerned, the American population is made up of mindless sheep, who are incapable of logical decision making. If our engines weren't incompatible with todays, (regulated) oils, gasolines, and other fluids, which are corrosive to any system not designed around them, then there would be many more cars, produced before 1985 still in use. This whole idea of replacing obsolete products (cars, computers, laborers, machines, buildings), with newer things, works to boost our GDP, as the sale of used items is not counted. The resent Cash for Clunkers program, is a possible example of the Government trying to expand GDP by offering incentives to people who replaced their obsolete cars with new ones. Regulating oil and fuels, to force the future to come now, is a way for the Government to take older cars off the road, at the expense of emissions and fuel efficiency, which will in turn cause the GDP to raise, slightly.