Engine Smokes

[TN90-ZR1]

I have a 90 ZR-1 w/ 41k on the clock and an engine that's started to smoke. I figured I'd get some expert advice on exactly where to begin here on the registry. Here's the details

Smoke is blue in color
Smokes and has a strong ordor when initailly started then disapates when run about 15 mi. or so
Doe's not burn any oil ( at least from dipstick indicator )
Doe's not leak any oil
New plugs and wires less than 2k mi. ago

Any assistance would be welcome and thanks in advance.

[LGAFF]

No seals on the exhaust valves.....try a 15-50 oil Mobile 1 carries it

[LGAFF]

if its a fuel smell and bogs, could be an injector

[scottfab]

I have a 90 ZR-1 w/ 41k on the clock and an engine that's started to smoke. I figured I'd get some expert advice on exactly where to begin here on the registry. Here's the details

Smoke is blue in color
Smokes and has a strong ordor when initailly started then disapates when run about 15 mi. or so
Doe's not burn any oil ( at least from dipstick indicator )
Doe's not leak any oil
New plugs and wires less than 2k mi. ago

Any assistance would be welcome and thanks in advance.

The only time this happened to me it was when I put in too much oil.
Oil level ok?
What do you use?
How long have you had it?
Has it been sitting?

[Pete]

1990 ZR-1's/LT5's did not have exhaust seals, they get a puff of smoke at start up no harm done,basicly normal.

If you ever do top end job i would suggest installing exhaust seals.

Pete

[scottfab]

No seals on the exhaust valves.....try a 15-50 oil Mobile 1 carries it

I use mostly 10w30 (6 qts) then 10w40 to top it off (2qts)

[LGAFF]

When I went to 15-50 race oil it stopped on my 90 and 15-50 is the weight many turbo motors use to stop turbo blow by

[Jim Nolan]

Plus if I recall Mobil 1 15-50 has the high ZDDP content.

[Paul Workman]

I use mostly 10w30 (6 qts) then 10w40 to top it off (2qts)

Hmmmm....

T'would be interesting to see how/why you determined that (the equiv of) 10W-32.5 is significantly different from 10W-30 - enough so anyway to go thru the bother...:icon_scra

P.