Stryder

I use 10w will moving to 5w be a good move!
This is for the v6 2.8L autoTrans with ac

Guest

About all you can do is try it. It may use oil with the thinner weight in which case its too thin for your car. Using any oil now?

KrisW

iTrader: (5)

Please state what year your engine is. The reason for this is that 86 and older 2.8's have a serious oiling problem and will eat bearings with thin oil. The 87 and newer 2.8 / 3.1 family are good to go with 5w30.

Air_Adam

If you are in a really cold climate, then 5w isn't a bad idea, even if the engine calls for a 10w. I use a 5w30 synthetic in my 350 in the winter, and 10w30 in the summer.

The lower the first number is (the number before the 'w') then the lighter the oil will be when its cold, which is why its good to use the 5w in really cold climates like here in Canada.

If the second numbers are the same (the number after the 'w') then they two oils will behave about the same when they are warm - warm meaning the engine is warm, not the outside temperature.

So a 5w30 will be thinner than a 10w30 when cold, but when warmed up, they will behave about the same.

Why do you want to use the thinner oil? Being in Texas, you shouldn't have any problems with oiling like we do here in Canada when its -40 outside.

Stryder

Well it is time for an oil change!
I have a rebuilt 2.8 like in 2000 so I exchanged the '86 motor as the crank was broken and the time to stab engine frame was less than the turn around for the original.(cepten the heads had them cheened)
My thoughts on thinner oil is better pressure on the topside, not sure there though!
ne heys I plan to move to a synthetic,
guess I will stick with the 10w for it is hot as hell here
We are wearing shorts with no shirts already(sorry no beerbelly photos) Its not the bestest car but it is still bitchen to drive!!!

KrisW

iTrader: (5)

is your rebuilt engine built from a 1987 or newer core? If not, you will have the same crank problems again. The block and crank are both revised after 1987

Stryder

Not sure of the rebuilt year
The exchange service guy said the motor was from a truck
The original owner ran the engine to the ground
So he gave the whole car to me for 200 bucks
which I have dumped several thousands into woo hoo yippy yay
Well I have decided to use the same oil I started with Castrol 10w-30
In the thought to move to a Synth from a non- Synth I was warned that it could damage seals and start leaking

Sonix

iTrader: (1)

You son of a...... I'm going to go bundle up until I look like Kenny from south park - then go freeze. Aww heck, i'm going skiing, I can't complain.

Thinner oil is easier to move around. My cousin swears by a 0W20 synthetic, I think it might have been an amsoil blend.