79-L-82

Going to change the oil in the Vette for the 1st time since I bought it.

Switching to Mobil 1. :yesnod: Don't know what the previous owner used.
24Kmiles.

What weight is recommended for the L82?
I don't have an owners manual yet.

Thanks, :thumbs:


[Modified by 79-L-82, 8:25 AM 5/10/2004]

wombvette

I dont know what is recomended but I use 10-40 in most everything.

HDFLH67

Is synthetic OK to use in older motors? '75 here, new to me.
Thanks!

pws69

I have been extremely happy with the performance of Mobil 1 15W50 in my 69 350/350 since I started using it early in 2003.

Summerfun

Performance engine with higher miles....Mobil 1 15/50....as it is probably driven harder (that's why it has been upgraded)

Stock engine with higher miles.....Mobil 1 10/30......unless you have a heavier
foot, then 15/50

New engine .....Mobil 1 5/30

For interest sake, I was wondering if someone could comment on altitude's
effect on oil....including colder temperature

zwede

You want the thinnest oil that doesn't cause high oil consumption or low oil pressure. My 454 is running 5W-30 with good pressure and low consumption (about a quart every 4-5k miles). Hot idle pressure is 35 PSI.

MotorHead

Is the Mobil 1 15W-50 synthetic ?

OHSIXX

I use Mobil 1 Synthenic 10W30 in my Corvettes. Sorta the middle ground. :)

BB wowbagger

Newly built 461 and i was recommended to use 20-50 Dino oil by the builder. :cheers: :cheers:

427V8

What makes you happy about the oil?
Have had it analysed or done a wear inspection?

If So I'd like to hear about it :D

NHvette

I agree with this most. :iagree:
Thicker oil is harder to pump up ... go light.
I use 5/20 in most of my vehicles ... 266k miles on my original Buick 3.8

:seeya

Pete76Shark

:iagree: :iagree:

The thinnest oil you can keep in the engine is best. My L48 will leak Amsoil zero weight (from the rear main seal) but it holds the 5W-30 just fine so thats what I ride with.

79-L-82

Wow!
I didn't expect this much variety.
5w30 is what I use in most of my other vehicles. That is what is in the owners manuals of them. They are a lot newer though.

I will probably use that or a 10w40 or 10w30.

I was mainly wondering what the owners manual would say. Anyone have one that they could reference?

Sounds like the 5w30 may get the nod based on what everyone is saying. . .



[Modified by 79-L-82, 1:36 PM 5/10/2004]

Tom73

Let me add my 2 cents worth here.

I would go with either 5w30 or 10w30. The most wear occures on start up. So you want the thin stuff (5 or 10) so that it will quickly get through the engine and protect the parts. There is almost zero wear running down the road with a warmed up engine. So 30 is more then enough there. So 5w30 or 10w30. I would stay away from the 40 or 50 unless you are doing a lot of towing or the car has a race engine. That heavy of an oil is hard to pump through the engine and could be hard on tight clearances and hydro lifters.

I use Mobil 1 10w30 in all three of my Vettes (two 73s and one 90). The truck gets Mobil 1 5w30 but may change to 10w30 as it is about to hit 100K.

One other thing about the owners manual, its recomendations are based on what was available at the time. So your manual would reflect 25 year old data (or data that is 25 years out of date :) )

tom...


[Modified by Tom73, 12:43 PM 5/10/2004]

Summerfun

When choosing an oil, viscosity stability is more at issue as related to your driving habits than "thinness"
The part befor the W on the can is related to winter conditions....

Read this write-up: http://www.wearcheck.ca/literature/techdoc/WZA007.htm

Tom73

It is a rating of how the oil flows before it warms up. After the W is how it flows once it is warmed up.

tom...

79-L-82

Thanks All!!
:cheers:

Summerfun

Quote from the website above:

"The advantage of using a multigrade oil is that is has greater viscosity stability over a wider range of temperatures. The oil behaves like an SAE 20W when it is cold and an SAE 50 when it is hot. The 'W' in all the SAE grades actually denotes winter ."

baja216

Check out this link related to oil related topics!

http://theoildrop.server101.com/cgi/ultimatebb.cgi?

:auto:

gliot1

I spent hours on this; reading, researching, etc. Oils have changed greatly since the 70s. I was using a small amount of oil and after reading dtermined by manufactureers writeups that 20W50 would be better suited for a car older that 25+ years. Sure enough, my consumpiton dropped, oil pressure higher. the only thing is you really shouldn't run it under +40F. I chekced my '78 owners manual to confirm things, and it showed 20W50 for +50F-over +100F. Since this research and experiment of number of other of my club members switched and saw the saem results. There are some excellent writeups on the web explaining the scientifics, and that is waht convinced me.