Synthetic Oil Comment---Bad News??

[Bob Yates]

synthetic oils

Well I'm going to throw a wrench in the middle. I use a blend. Semi- synthetic and I change about every 7,500 miles. I use it in all my cars and I think it just makes me feel better in side. Don't know what it's doing inside my engines but everything seems to be fine. If it ain't broke don't fix it. Does anyone know what the TBN ( total base number) is for synthetic oils ? I sure don't. But I know that's important.

 

[yellow81]

Bob, your question about the TBN, total base number for synthetic oils can be be found @ go-synthetic.com/properties.
For Amsoil, (for example): Their series 2000 0W-30, which I use a lot, is >11.0
20W-50 is >11.0 ----- the XL 7500 series for 5W-20 is >9.0, 5W-30 and the 10W-30 in the XL 7500 series is both 9.0
the XL series was produced primariarly for service stations to provide to customer to get service on a regular oil change. Which is 7,500 miles. The regular Amsoil 100% synthetic changes for oil is 25,000 miles or 1 year. Their filter changes are every 6 months. The series 2000 0W-30 oil change is 35,000 miles.
The 100% synthetic 5W-30 TBN is >11.0, 10W-30 is also >11.0
They have a semi-blend also, 10W-40 -- >11.0
The high performance sythetics for 10W-40 and 20W-50 are >12.0

Bob there are even more and I do believe for the oils you may be using too. If the Amsoil stuff is interesting to you let me know I could get you some more info.

 

[Bob Yates]

Thanks for the info. I just got rid of my 81 last August. I mis it. I now have a 86 C4 conv. with aluminum heads. It's cool but my 81 was show stopper. I owned it 7 years had a lot of fun with it . I have a lot of new parts which I never used . Weatherstrips and stuff if you would like a list let me know. I have a vacuum powered heat rizer that's brand new , new GM motor mount. All of the foam seals that go around the raditorand more. Take care......Bob

 

[yellow81]

Bob, thanks for the reply. If you don't mind I would like to get a list from you regarding your '81 parts. At the moment I don't need anything, ( as far as I know ), we've got the snow here, and I got the car in November, so it's just been the light tinkering, tightening thing. But I do need a rear view mirror, the glass reflecting stuff is starting to go.
E-mail @ bwalton41@hotmail.com

Thanks --- Brian

 

["94 Sixspeed]

Wow

I think it's fairly well established that you can go 6k miles or more between OIL changes, but still make sure to change the FILTER every 3k miles. I change oil in my daily driver (96 Legacy Outback) every 10k miles, but filter every 3k or so. 130000 miles and no problems other than the leaks those cars are known for anyway (see, Vettes aren't the only ones with legendary oil leaks!).
[RICHR]

You got to be kidding... This will probably extend the life of your car by at least 5 or 10k miles.. It will last at least 250k either way, or at least it should.. By then it's time to think about some real power... Or a whole new ride..

 

[yellow81]

Hey, if you really like the car you can keep it for as long as you want, especially using Amsoil. The Amsoil Action News mag. they put out has testimonials in it all the time about tear downs and the engines still remaining at specs, even with the big rigs. Log onto to amsoil.com for more info. or if you need other info. like a catalog of spec sheets please let me know. I would also be glad to order whatever you need or help you become a dealer yourself. '94, remember it will also help lower your temps. 10-20 degrees in the engine and tranny. The oil does not break down and will not void any factory warranties, they put it in writing.

regards,

Brian

 

[jaa1988]

All I can say is I had a minor valve cover leak before I switched to Mobil 1, I still have a minor valve cover leak after switching to Mobil 1.

I switched at 120+K a year ago. It uses less than 1 qt between changes. I'll keep using Mobil 1 because the engine seems happier.

 

[yellow81]

jaa1988, have you determined where the leak is?, a bolt (coming out of threads), type of gasket, or gasket not lined up properly?
Do you think it is the oil causing your leak????
You will find the 100% synthetic oil is a little more "stickier" , I can't say that it will help for sure, but your engine would still be, if not more happier.
I think there has to be some type of source where your oil is being allowed to escape. Any pitting on the heads? Good Luck
Brian