Is Mobil 1 tri-synthetic one of the best? What grade, 5w or 10w? and how much do you need in a L98, 4 or 5 qu? (don't have manual)

 

I use 5qt's of Mobil 1 15W-50 and a PF-35 Filter in my L98

 

5 quarts Mobil 1 and a PF-25 filter for my LB9.

------------------
Kevin Irving
85 Trans Am WS-6, 305 TPI, custom burned '86 PROM with '87 "165"ECM, Accel Supercoil & 8.8 Wires, Rapidfire #2 @ .055", MSD 6AL, 1.6:1 Roller tipped rockers, Homemade AFPR, K&N cone, no airbox, Aluminum Driveshaft, Wonderbar, TB Coolant Bypass, Ported Plenum, Descreened MAF, Syclone Fuel Pump, JET Airfoil, Mobil 1 synth in all but transmission.

15.556 @ 86.65mph, Nov 10, 2000.... I know it sucks.. but it will get better!

http://www.geocities.com/transam85tpi/

Member - The Tidewater Trans Am Club, Norfolk VA http://www.geocities.com/ttacva/

 

I use Mobil 1 fully synthetic motor oil 10W30. I would only use recomend using synthetic oil if you have new valve seals. The synthetic oil will drop right down into the chambers if you have bad seals. This will cause you to burn about 2 quarts of oil per 3000 miles. When this oil costs about $4.50 a quart, thats a lot of money you are throwing away.

------------------
1987 Chevy Camaro IROC-Z
L98 TPI 350 (5.7L)
TH 700R-4 Transmission
Borg Warner 7.75" 9 Bolt Rear End

Current Mods: LT4 HOT Cam, Comp Cams 1.52:1 Roller Rocker Arms, Edelbrock TES 1 5/8" Headers, Hooker 3" Aerochamber Cat-Back System, Performance Resource Chip, Accel Ignition Coil, Cap, Rotor, 8.8mm Wires, K&N Filters, JET TPI Air Foil, All Free Mods, Falken ZIEX Z-Rated Tires.

Best ET (w/o LT4 cam): 14.32 @ 97.7mph
(corrected for elevation)

Soon to Come: 7.625" 10 Bolt with 3.42s and Accel TPI Intake Base

 

My L98 takes 5.5 quarts. I know the spec is 5 quarts, but the spec is the same for all V8's with or without the oil cooler. So I guess the oil cooler holds .5 quarts.

------------------
89 Transam GTA, 350TPI, auto, 3.27 rear, dual cats, gray.
Magnaflow cat-back,
K&N open element,
Best E.T. 14.63@95mph

 

You are so right about that. That's exactly what happened to me. Using regular oil now, 20W50, but want to bring viscosity down to 10W30 or so.
Rick



------------------
'88 GTA 350 Full of Leprosy (rust)
Full Exhaust, Free mods, Xtreme Energy cam, Intake Pieces and 2100 RPM TQ

13.39@102.50 MPH
1.90 Sec ----- Best 60FT
104.23 MPH -- Best Trap Speed
AIM HIGH!

 

Believe it or not mine used to smoke everytime on start up cause of the seals. After i put in the mobil 1 it stopped. Dont ask me how.

 

castrol GTX here 10/30 or 10/40 depending on time of year........

------------------
1989 pontiac firebird
bright red exterior(just repainted)
grey interior
5 spd
305 TBI (stock)
WS.6 formula wheels
3.73 posi rear end
http://members.aol.com/j007golden/Mikey89.html
http://www.geocities.com/firebird/myfirebird.html
-------------------------
1985 trans am
factory bright yellow
4 wheel disks
16 inch wheels
305 TPI
power antenna and mirrors
t tops

 

The #1 motor oil, Royal Purple.

I dont use it yet cause my engine is eating some oil already, but once I do my heads and put new valve seals in ill be using it, as long as my rings look ok Until then i use 10W/30 Pennzoil, they best non-synth oil u can run

 

Yuck.... Pennzoil. I'd rather put baby oil in the crankcase!

 

Since Pennzoil changed to pure base it is the best conventional oil. As far as the Mobil 1 not smoking as much as conventional oil past the valve seals it shouldn't. I don't remember why. I used to have a 1985 BMW K100RS motorcycle and when I left it one the centerstand it smoked terrible. The dealer said to put Mobil 1 in and it would stop. I did, and it did, he was right. I remember having it explained why it worked but I forgot.

 

Are you talking about the synthetic Mobil 1? And it costs about $4.50/qt.? I need to replace my valve seals but might try that type of oil instead...

KAM

(by the way, my L98 has lived on Pennzoil all its life without any problems. The intake and valves, etc. were spotless last year when I had the top half opened up. I know - shoulda done the valve seals then...)

 

Mobil 1 synthetic and K&N oil filters.

 

ill second that formula8!!

------------------
87 IROC-z 305 TPI 5spd Borg warner 9-bolt 3.45 posi 4 wheel disc,8.8 Accel wires , bosch platinum +4 plugs,gutted air box,TB coolant bypass ,polyurethane tranny and torque arm mounts, k&n oil filter,synthetic oil 10w30, futura GLS super sport tires 265/50/15 rear and 235/60/15 front mounted on 86 monte carlo SS rims ,

400 sbc and a 6 spd in the works

 

I'll third it! I've been using Mobil 1 oil since I had about 70k miles on my IROC, and now I have over 131k miles and it still isn't burning or leaking oil and the oil pressure is 45 cold and 30-35 hot. I'll be pulling out my 305 to swap in a 355 over Memorial Day weekend, and I'll tear apart the 305 to see how clean inside it is.

------------------
Greg Westphal
'87 IROC 305TPI/A4

 

Another vote for Mobil 1!!!!!

 

I'm tossing this in the general tech/engine dept. because this really don't have much to do with TPIs. Plus, you may get more responses.

------------------
-Bill

-=1987 Buick Grand National=-
Almost Jacked Up Like a Mother

*CC 218/218, ported and polished heads (1.77, 1.50), Accufab AFPR, custom DP by Custom Tubes,
Walbro 307 hotwired, Big Mouth cold air intake, 009s, custom PROM and 20psi of fury*

Wanna try me?

-=ICON Motorsports=-

Modertor TPI board