what is put in from factory, (oil) 99 T/A

[camaroinx]

i don't have my manual and my oil filler cap says only refer to manual---i bought 5w-30 castrol syntec--i know mobil 1 is best but i did not have money for it and they did not have 10w-30---i think they recommend 5w-30---don't they?

[camaroinx]

i just did search

and answered my own question---5w-30 is cool

[raroZ28]

i don't have my manual and my oil filler cap says only refer to manual---i bought 5w-30 castrol syntec--i know mobil 1 is best but i did not have money for it and they did not have 10w-30---i think they recommend 5w-30---don't they?

I wouldn't say mobil 1 is best. Castrol fully synthetic is just as good. 5w30 is recommended, and it's all I use.

[Z Ya Later]

Mobil1 and Castrol are decent, but Red Line and Royal Purple are the way to go if you're serious about it.

[raroZ28]

Mobil1 and Castrol are decent, but Red Line and Royal Purple are the way to go if you're serious about it.

Not necessarily... Royal purple is a waste of money for a daily driver/street cruiser. I know of only one guy running it, and it's an 8 second fox body mustang.

[Z Ya Later]

Not necessarily... Royal purple is a waste of money for a daily driver/street cruiser. I know of only one guy running it, and it's an 8 second fox body mustang.

Yeah, I'm gonna have to disagree. I run it in both the Jeep and Z and love what it offers. Gives a little extra zip plus better gas mileage. Heck, I saved about 1/3-1/2 a tank of gas in the Jeep when I first put it in and took it to Sac. last year, which translates to about 6-9 gallons!!!! When you've gotta fill that beast, every bit helps. Granted its geared more toward racing applications, but the results are still there on the street.

[Joe K. 99 Zeee!!]

Here's what I've learned from reading around....Check out the fourm on www.bobistheoilguy.com. One of the experts there has a 95Z and does regular oil analysis on his spent oil. He's found the best wear protection is given from the German blend of Castrol Syntec 5w-30. The LT1 likes a thicker oil for the least wear. I think he also suggests Mobil1 10w-40. GM suggests 5w-30 I think mostly for milage benefits. I'm running Mobil1 10w-30 right now. It's on the light side for a 10w-30 oil. Milage is down slightly, but the engine sure sounds smoother and quieter.

Do a search on that sight and you'll find some info for LT1's. Oh...you can find your manual here:

http://shbox.com/pdf/manuals.html

[fastTa]

Yeah, I'm gonna have to disagree. I run it in both the Jeep and Z and love what it offers. Gives a little extra zip plus better gas mileage. Heck, I saved about 1/3-1/2 a tank of gas in the Jeep when I first put it in and took it to Sac. last year, which translates to about 6-9 gallons!!!! When you've gotta fill that beast, every bit helps. Granted its geared more toward racing applications, but the results are still there on the street.

What works for racing doesn't always work for the street. However, a lubricant is definitely an exception. I gotta agree with Steve93Z....the better the oil the better the performance and durability. Cold engine startups are much harder on street motors than people realize.

[95TransAm]

What works for racing doesn't always work for the street. However, a lubricant is definitely an exception. I gotta agree with Steve93Z....the better the oil the better the performance and durability. Cold engine startups are much harder on street motors than people realize.

I too am going to have to agree with this statement. I've heard that 99% of engine wear will happen during a cold startup. Being that i am over 100k, i figured good lubricants were the way to go, thus the reason why i am running with royal purple 10W-30. I also will say, that when i made the switch, i did notice that she did start to run a little bit better it seemed.
Jusy my $.02

[Rhode Island Red]

I am goping to try Mobil 1 0W40 .. Zero weiggt for those cold start-ups and 40 weight to help seal the rings better.. I am an oil burner... trouble is that I tried 8 places to find Mobil 1 0W40 or 10W40 synthetic, but for some reason, no one has it around me

[Christopherrr]

hmmm...I've been running Mobil1 from day one...is Royal Purple that much better??? If so, I'd do the switcharoo...but I've never seen it before other than advertisement.

[95TransAm]

hmmm...I've been running Mobil1 from day one...is Royal Purple that much better??? If so, I'd do the switcharoo...but I've never seen it before other than advertisement.

I've never tried mobil1, i'm just referring to when i switched over to it after i bought my car, so i really cannot compare the two. After the switch though, i did notice that it seemed like she was runnin a lil bit better. Also, and this might seem weird, but i notice a strange power increase also. Like, when i start my car, for about the first 8 minutes or so, my oil pressure will be around 40, and the car will run good. Then though, after those first 8 minutes, my pressure will drop in half, and i notice a power increase from there on. It consistently does this 100% of the time. I know royal purple was advertised at 3-5% extra proven hp, but i don't go by stuff like that. I have heard that it was a real good oil though, thus the reason why i decided to use it.
But then again, at roughly $6.50 a quart i hope it would be good

I've heard nothing but good things about mobil1 though, it was just the route i decided to go once i got the t/a being that she has higher miles and that i like to spoil her as well

[raroZ28]

hmmm...I've been running Mobil1 from day one...is Royal Purple that much better??? If so, I'd do the switcharoo...but I've never seen it before other than advertisement.

Yes royal purple is the best oil you can buy. Red line makes great lubricants as well, I use redline in my transmission.

I change my oil every 1500-2000 miles, so spending $8/quart on royal purple isn't feasable. If you have the means, go for it.

[Christopherrr]

awesome...looks like I'm doing the switcharoo my next oil change...due really soon...

Royal Purple...it is...we'll see how this stuff will run. Couldn't hurt...

oh....sorry for the hijack