1968CutlassSupreme

Hello All!

I live in Western North Carolina and need some information on general maintenance for my 1968 Cutlass Supreme. I need to know what oil is best for it, what kind of oil filter I should use, how to change the transmission fluid and filter, and what coolant is best to use - and how to flush the cooling system.

I know these are basic things but I've only owned new cars and they all seem to need specialized fluids and such, so I am a little lost when it comes to the older cars.

Thanks!

MDchanic

Oil filter: WIX or NAPA Gold (they're the same filter). All of us who have taken oil filters apart have been impressed by the construction of the NAPA and depressed by the construction of the Fram (DO NOT use Fram).

Oil: One of the "Off Road" oil mixtures containing ZDDP.
Not synthetic, unless you've recently installed all new gaskets.
10W30 - 10W40 in your "winter," 10W40 - 20W50 summer.
Danger: Potential virulent "What is the Best Oil?" debate ahead.

Coolant: Green, mixed 50/50 with water.
Danger: Potential "Distilled Water / Tap Water" debate ahead. Just use tap water, unless you're in an area where you need a chisel to cut your water.

Coolant Flush: Get one of those Prestone thingies, install it in your heater hose, and follow the directions. You can get a brass Female-Female hose attachment that flows much better than the plastic one that comes with the kit.
If the system is really gunked up, you may want to use "radiator flush" stuff, but be advised, if the gunk is plugging the holes in the radiator, you'll find out.

Transmission: Dextron, just like it says in the manual.

Transmission Filter: Go to the auto parts store, ask for a filter for a TH350 or a TH400, whatever you've got.

Draining Transmission: Do what it says in the manual: Remove umpteen screws, drop pan, take bath in ATF, install new filter, pan, and gasket, do not overtighten.

Good luck!

- Eric

jaunty75

No argument here.

I've been told by an auto restorer I respect highly that using modern oil is fine, but put in a container of STP oil treatment along with the new oil to get the needed ZDDP. I just buy a good, name-brand 10W30 or 10W40 at the local auto parts store and the STP at the same time.

I've used tapwater in my cars for 40 years without a problem. But going to the store and buying a couple of gallons of distilled water is very cheap, and if using it makes you feel better, go for it.

Also, all of the containers of orange, "long-life" coolant now say on them that they're usable in ANY car, with the word "any" emphasized. Can I use this stuff in my '67 and my '73? I am finding it a bit more difficult to actually find green coolant at some of the stores I visit. Is green coolant going away?

1968CutlassSupreme

What is "ZDDP?" Is that something that is in the STP oil treatment?

MDchanic

ZDDP is Zinc dithiophosphate.

It is a substance that helps lubricate high-pressure friction areas, such as flat cam tappets.
It has been essentially eliminated from modern motor oils because it can poison catalytic converters.

Does your computer have access to Google?

- Eric

jaunty75

C'mon, man! In the time it took you to type this question, you could have Googled "ZDDP" and had your answer and then some.

http://en.wikipedia.org/wiki/Zinc_dithiophosphate

http://barsproducts.com/blog/the-str...zinc-additives


Yes, it's in STP Oil Treatment.

jaunty75

Beat me to it by mere seconds!

1968CutlassSupreme

Wow, take it down a notch, will ya? I could have easily googled this question, as I can any other question I have, but I prefer to ask those who are into this stuff here at this fine site. It's kind of like going to a friend who's into your interests, rather than just a group of strangers...

I'll make sure my questions are more, um, "complex" from now on.