Bit confused?
Are you talking about?
Example:
Replacing your oem/factory (oil) strut assembly with a gas (say NAPA parts) cartridge, and wonder what kind of oil to put inside?
If this is it, a little 10w30 is fine, or whatever you have will do.
If you are talking about trying to repressurize the oem struts someway/somehow with oil, I dunno.
I used bilstein strut assembly when I changed out my struts. All I had to do was switch over the oem springs, boot, and top, along with some new sway bar links. It was SO MUCH EASIER, plus they look great.
NOTE: THESE DO NOT COME WITH THE NICE BLUE BOOTS, THEY COME WITH NO BOOTS...
GREAT PRICE THOUGH.
http://replacement.
.com/parts/
/quote.jsp?year=1991&product=L3000-108817&application=000476737∂=Strut%20Assembly&dp= true