Quote:
Originally Posted by Hib Halverson
Note my use of the phrase: "...if it's very noticeable and happens regularly..."
I should have maybe added something like "...more than a little...".
I agree that a little oil smoke on cold starts is indicative of a 90 w/o exhaust valve stem seals and with some miles on the engine.
I've often wondered why Lotus and GM did that. I've also often wondered if the reason that happened.
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Excellent point. The fine distinction between the lack of oil seals and symptoms of something more serious is important to make: deserving of avoiding the risk of blowing smoke off as "normal" for a 90 LT5 due to seals when in fact other things should be considered.
So, the description of the lack of oil seals might should be refined to specify:
"At startup" BLUE (oil) smoke appears after the motor was at rest and is more noticeable the longer the motor was at rests up to (say) overnight. However, if smoke of any color persists, and especially under heavy throttle, then more serious issues exist beyond mere valve stem oil seals".
As for why they didn't install the seals on the exhaust stems in the first place, I believe I read it somewhere - sort of tongue-in-cheek, "Oil consumption?? Hey, it's a British thing!"
